小学分数方程专项练习180题

发布时间:2020-04-15 00:57:17   来源:文档文库   
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分数方程专项练习180题(有答案) 



(1)+X=

(2)X﹣=

3x+x=42,

4=

5)5x﹣3×=

6x+=

7+2x=

8)12÷(x+)=1.2,

9

10

11X×2=4×5,,

12)X﹣X=

(13)90×+x=20,

14)0.2x+=8﹣x,

15)X+(3X﹣16)÷=10(X+1),

15=

16X﹣X=1,

17x+x=42

18

19=1,

20)2X+1=2

21)﹣x=

22)x+2=4.25

23)x﹣(1+)=4.5

24)37.5++x=69

25

(26x=2.4×5,

27)x﹣+=

(28x+x=121,

29)(x+)×7=8.1,

30=

31)4x+=5,

32)+x=9,

33)x﹣x=

34)x+x=11,

35)2x+=4.625,

(36﹣2X=

37)x﹣x=2,

38+21.5=x,

39﹣3x=

40+x=

41x+5×4=95

42)x﹣x=

43﹣3χ=

44x﹣x=0.2,

45)y﹣4﹣y=18,

45

(46×3+2.75x=

47

48)5x﹣3×=

49x=

50)x+x=39,

51)7x﹣3x=

52x+=

53=

54

54

55)5x﹣=34

56x﹣×6=

57x+1.2x=25

58)8﹣4.5x=

59x﹣0.95×4=8.5,

60)2x﹣=2+

61x+x=

62)x﹣=2﹣

63=2.5,

64x=18,

65x﹣=

66)x﹣x=

67

68

69)x﹣x=

70)1.25:0.25=

71)1﹣x=

72x+x=

73x+x=42,

74)x+0.25=

75x=10×

76x+x=2

77)x×(1﹣37.5%)=

78(x+)=2,

79x=50×

80x+x=42,

81)4+x=102,

82X+X=

83X=

84)(1﹣)X=

85)χ﹣χ=

86χ=42×

87)8x﹣×3=

88+=1,

89)3x﹣×=50%,

90)3x﹣x=

91)+x=

92)﹣x=×

93÷x=0.8,

94x+5×4=95,

95)x﹣x﹣4=18,

96÷ⅹ=

97)x×=4,

98ⅹ=

99ⅹ﹣6=7,

(100+5x=110,

101x﹣4=60,

102)x﹣x=9,

103)x﹣x=3.6,

104÷x=

105=9.1,

106)4(+x)=

107×0.25+x=

108x+x=

(109

110

111+3x=

112=

113×﹣X=

(114)=30,

(115)x=7,

(116)x=×10,

(117)X﹣X=6,

118X﹣2=13,

(119)(1﹣)X=480,

120)6X+X=39,

121)2.4﹣=3.2﹣x,

(122)

123

(124)X﹣X=

(125)6X+4.5=

(126)80%X﹣0.6=4.2,

127X+X=

(128)X+X=

(129÷x=

130)x÷=42,

131x+=

(132X﹣=

133X+X=3,

134X+=×8,

(134

135

(136)x﹣7.5=

137)2X+=1,

138)X÷=

(139X﹣X=1.5,

(140)x=28×

(141)(x+3)×=48,

(142)x﹣=

(143)

(144)2÷x=2,

145)3﹣4x=2

146=÷

(147)÷x=÷

(148)X﹣25%X=135,

149X﹣12.5×4=0,

(150)x+×=1,

(151) x×()=

(152)﹣1.5x=1.1,

(153)xx=2,

(154x﹣=

155)x﹣x=15,

(156)X÷=

157(X﹣)=

158X+X=×

(159﹣x=

160)x+0.75﹣=0.15,

161)2x+=4.625,

(162÷4.8x=15.8,

163x=14,

(164)x+x=2.1,

165)2.7÷120%x=9,

166)(13﹣X)×=6,

(167)x﹣21×=4

(168)1x+x=

(168)x×()=

(169)2+x=5

170)4x﹣=

(171)x÷=

172)x﹣x=3

173)6x﹣3.5x=÷

(174﹣3X=

175

176)5X﹣3×

177)x××=5

(178χ=

179χ+χ=

(180x=

181x+15=40

182)x÷=

专项练习参考答案:

(1)+X=

+X﹣=

X=

(2)X﹣=

X﹣+=+

X=

3x+x=42,

+)x=42,

x=42,

=42×

x=36;

4=

4.5x=8,

4.5x÷4.5=8÷4.5,

x=

5)5x﹣3×=

5x﹣

5x

5x÷5=

x=0.7

6x+=

x+=

x=

=÷

x=

7+2x=

+2x﹣=

2x÷2=÷2,

x=

8)12÷(x+)=1.2,

12÷(x+)×(x+)=1.2×(x+),

1.2×(x+)=12,

1.2×(x+)÷1.2=12÷1.2,

x+=10﹣

x=9

9

x=

=4÷

x=

10

3x﹣+=+

3x÷3=÷3,

. 

11X×2=4×5,,

X=20,

=20×

X=15 

12)X﹣X=

(1﹣)X=

X=

X×3=×3,

X= 

(13)90×+x=20,

15+x=20,

15+x﹣15=20﹣15,

x×2=5×2,

x=10;

14)0.2x+=8﹣x,

0.2x++x=8﹣x+x,

1.8x+=8,

1.8x+=8﹣

1.8x=7.2,

1.8x÷1.8=7.2÷1.8,

x=4 

15)X+(3X﹣16)÷=10(X+1),

X+(3X﹣16)×4=10X+10,

X+12X﹣64=10X+10,

13X﹣64=10X+10,

13X﹣64+64=10X+10+64,

13X=10X+74,

13X﹣10X=10X+74﹣10X,

3X=74,

3X÷3=74÷3,

X= 

15=

+2x=+2x,

+2x=

+2x﹣=

2x=1,

2x÷2=1÷2,

x=0.5 

16X﹣X=1,

)X=1,

X=1,

X×2=1×2,

X=2;

17x+x=42

+)x=42

x=42

x=42÷

x=36

18

=

=

=

=

÷=÷

x=

19=1,

)×6=1×6,

4x+2﹣3x+3=6,

x+5=6,

x+5﹣5=6﹣5,

x=1 

20)2X+1=2

2X+1=2

2X÷2=÷2,

X= 

21)﹣x=

x=

x=

x=

22)x+2=4.25

x=4.25﹣2

x=4﹣2

x=3﹣2

x=1

23)x﹣(1+)=4.5

x﹣(1+)=4.5

x﹣1=4.5

x=4.5+1

x=4+1

x=4+1

x=6

24)37.5++x=69

37.5+0.2+x=69.5

37.7+x=69.5

x=69.5﹣37.7

x=31.8

25

x=18 

(26x=2.4×5,

x×6=12×6,

x=72;

27)x﹣+=

x﹣=

x﹣=

x= 

(28x+x=121,

x=121,

x=132;

29)(x+)×7=8.1,

7x+6=8.1,

7x+6﹣6=8.1﹣6,

7x÷7=2.1÷7,

x=0.3;

30=

×3.6=×3.6,

x=15

31)4x+=5,

4x+=5

4x÷4=

x=

32)+x=9,

+x=9

x=

33)x﹣x=

x=

x×6=×6,

x=5;

34)x+x=11,

x=11,

=11×

x=

35)2x+=4.625,

2x+=4.625﹣

2x=4,

x=2,

(36﹣2X=

﹣2x+2x﹣=+2x﹣

=2x,

2x=

x=

37)x﹣x=2,

x=2,

=2×

x=

38+21.5=x,

22=x,

22×=

x= 

39﹣3x=

14﹣48x=11,

48x+11=14,

48x+11﹣11=14﹣11,

48x=3,

48x÷48=3÷48,

x=

40+x=

3x+1=2,

3x+1﹣1=2﹣1,

3x=1,

3x÷3=1÷3,

x=

41x+5×4=95

x+20=95

x=95﹣20

x=75

x=75÷

x=125

42)x﹣x=

x=

x=

x=

43﹣3χ=

﹣3χ+3x=+3x,

3x+=

3x+=

3x=

3x÷3=÷3,

x=

44x﹣x=0.2,

)x=0.2,

x=0.2,

x=8.4;

45)y﹣4﹣y=18,

y﹣4=18,

y﹣4+4=18+4,

y=22

y=88

45

=×÷

x=

(46×3+2.75x=

+2.75x=

+2.75x﹣=

2.75x=

2.75x÷2.75=÷2.75,

x=

47

5x=4.8,

5x÷5=4.8÷5,

x=0.96;

48)5x﹣3×=

5x﹣=

5x﹣+=+

5x=

5x÷5=÷5,

x=. 

49x=

=×

x=1.5;

50)x+x=39,

x=39,

=39×

x=24;

51)7x﹣3x=

4x=

4x÷4=÷4,

x=

52x+=

x+=

=

x=

53=

)x=

x=

=÷

x= 

54

0.9+x=3.2﹣x+x,

0.9+x﹣0.9=3.2﹣0.9,

x=2.3;

54

4.5+2.75x﹣4.5=﹣4.5,

2.75x=1

2.75x÷2.75=12.75,

x= 

55)5x﹣=34

5x﹣+=34+

5x=34

5x÷5=34÷5

x=6.95;

56x﹣×6=

x﹣4.8=

x﹣4.8+4.8=+4.8

x=5.55

=5.55÷

x=18.5 

57x+1.2x=25

+1.2)x=25,

5x=25,

5x÷5=25÷5,

x=5;

58)8﹣4.5x=

8﹣4.5x+4.5x=+4.5x,

+4.5x=8,

+4.5x﹣=8﹣

4.5x=4.5,

4.5x÷4.5=4.5÷4.5,

x=1;

59x﹣0.95×4=8.5,

x﹣3.8=8.5,

x﹣3.8+3.8=8.5+3.8,

x=12.3,

=12.3÷

x=16.4;

60)2x﹣=2+

(2x﹣)×2=(2+)×2,

4x﹣x﹣1=4+x+1,

3x﹣1=x+5,

3x﹣1+1=x+5+1,

3x=x+6,

3x﹣x=x+6﹣x,

2x=6,

2x÷2=6÷2,

x=3 

61x+x=

x=

62)x﹣=2﹣

x﹣x+=2﹣x﹣

x+=x,

x++x=x+x,

x=

x=

x=

x=1 

63=2.5,

)×12=2.5×12,

4x+8﹣3x+9=30,

x+17=30,

x+17﹣17=30﹣17,

x=13

64x=18,

=18÷

x=27;

65x﹣=

x﹣+=+

x=

=÷

x=

66)x﹣x=

x=

=÷

x= 

67

x=1;

68

x﹣=

x﹣+=+

x=2 

69)x﹣x=

x=

=÷

x=

70)1.25:0.25=

0.25x=1.25×1.6,

0.25x=2,

0.25x÷0.25=2÷0.25,

x=8;

71)1﹣x=

1﹣x+x=+x,

x+=1,

x+=1﹣

x=

=÷

x=

72x+x=

x=

=÷

x=. 

73x+x=42,

+)x=42,

x=42,

=42×

x=36;

74)x+0.25=

x+0.25=0.25,

x+0.25﹣0.25=0.25﹣0.25,

x=0;

75x=10×

x×3=×3,

x=

76x+x=2

+)x=2

x=2

=×

x=

77)x×(1﹣37.5%)=

0.625x=

x=

=×

x=1;

78(x+)=2,

x+×=2,

x+=

x+=

x=

x×4=×4,

x=

79x=50×

x=15,

x×5=15×5,

x=75;

80x+x=42,

+)x=42,

x=42,

=42×

x=36;

81)4+x=102,

4+x﹣4=102﹣4,

x=98,

x×5=98×5,

x=490;

82X+X=

x=

x=

83X=

X+x=+x,

=+x﹣

x=

84)(1﹣)X=

x=

x=1 

85)χ﹣χ=

χ=

χ÷=÷

χ=3;

86χ=42×

χ÷=42×÷

χ=42××

χ=50;

87)8x﹣×3=

8x﹣=

8x﹣+=+

8x=12,

8x÷8=12÷8,

x=1.5

88+=1,

x+2=4,

x+2﹣2=4﹣2,

x=2;

89)3x﹣×=50%,

3x﹣=

3x﹣+=+

3x=

3x÷3=÷3,

x=

90)3x﹣x=

x=

=×

x= 

91)+x=

+x=

x=

92)﹣x=×

﹣x+x=+x,

=+x﹣

x= 

93÷x=0.8,

÷x×x=×x,

x=

x=

=÷

x=

x=

94x+5×4=95,

x+20=95,

x+20﹣20=95﹣20,

x=75,

=75÷

x=75×

x=125;

95)x﹣x﹣4=18,

(1﹣)x﹣4+4=18﹣4,

x=14,

x×4=14×4,

x=56 

96÷ⅹ=

÷x×x=×x,

x=

x×2=×2,

x=

97)x×=4,

÷=4÷

x=5;

98ⅹ=

ⅹ×=×

x=3;

99ⅹ﹣6=7,

ⅹ﹣6+6=7+6,

ⅹ=13,

ⅹ×2=13×2,

x=26 

(100+5x=110,

x+10x=220,

11x=220,

11x÷11=220÷11,

x=20;

101x﹣4=60,

x﹣4+4=60+4,

x=64

x=192;

102)x﹣x=9,

x=9,

x=9

x=30;

103)x﹣x=3.6,

x=3.6,

=3.6

x=4.8;

104÷x=

÷x×x=×x,

=x

x=4

105=9.1,

×7=9.1×7,

x=63.7;

106)4(+x)=

+4x=

+4x﹣=

4x=4,

x=1;

107×0.25+x=

0.2+x=

0.2+x﹣0.2=﹣0.2,

x=

x= 

108x+x=

x=

x

x=

(109

x=

110

x=90;

111+3x=

+3x﹣=

3x=

3x÷3=÷3,

x=

112=

4x=3×1.2,

4x=3.6,

4x÷4=3.6÷4,

x=0.9 

113×﹣X=

﹣X=

﹣X+X=+X,

+X=

+X﹣=

X=0

(114)=30,

×=30×

x=25;

(115)x=7,

)x=7,

x=7,

=7×

x=20;

(116)x=×10,

x=8,

=8×

x=11;

(117)X﹣X=6,

X=6,

=6÷

X=15;

118X﹣2=13,

X﹣2+2=13+2,

X=15,

=15÷

X=40

 

(119)(1﹣)X=480,

X=480,

=480÷

X=540;

120)6X+X=39,

6.5X=39,

6.5X÷6.5=39÷6.5,

X=6 

121)2.4﹣=3.2﹣x,

0.9=3.2﹣x,

0.9+x=3.2﹣x+x,

0.9+x=3.2

0.9+x﹣0.9=3.2﹣0.9,

x=2.3;

122

x=7,

=7

x=

123

+2.75x=

+2.75x﹣=

2.75x=

2.75x÷2.75=÷2.75,

x=

(124)X﹣X=

X=

=÷

X=

(125)6X+4.5=

6X+4.5﹣4.5=﹣4.5,

6X=2,

6X÷6=2÷6,

X= 

(126)80%X﹣0.6=4.2,

0.8X﹣0.6+0.6=4.2+0.6,

0.8X=4.8,

0.8X÷0.8=4.8÷0.8,

X=6;

127X+X=

X=

=×

X= 

(128)X+X=

X=

=÷

X= 

(129÷x=

x=÷

x=

130)x÷=42,

x=42×

x=9;

131x+=

x+=

x=

=÷

x=

(132X﹣=

X﹣=

X=1

x=1

133X+X=3,

x=3,

x=3

x=3

134X+=×8,

X+=4﹣

X=3

X=3

x=4

(134

3x﹣6+6=8.25+6

3x=15,

3x÷3=15÷3,

x=5;

135

+)x=15,

=15×

x=12 

(136)x﹣7.5=

x﹣7.5+7.5=+7.5,

x=13.75,

=13.75÷

x=2.75 

137)2X+=1,

2X+=1﹣

2x=

2x÷2=÷2,

x=

138)X÷=

×=×

x=

(139X﹣X=1.5,

)X=1.5,

X=1.5,

X×6=1.5×6,

X=9;

(140)x=28×

x=32

(141)(x+3)×=48,

0.5x+1.5=48,

0.5x+1.5﹣1.5=48﹣1.5,

0.5x=46.5,

0.5x×2=46.5×2,

x=93;

(142)x﹣=

x=

=

x=

x=0.5;

(143)

5x=3.2×8,

5x=25.6,

5x÷5=25.6÷5,

x=5.12

(144)2÷x=2,

2÷x×x=2×x,

22=2x÷2,

x=1

145)3﹣4x=2

3﹣4x+4x=2+4x,

3﹣2=2+4x﹣2

1=4x,

1÷4=4x÷4,

x=0.25;

146=÷

=

x=×

x=

x=

(147)÷x=÷

÷x=

x=÷

x=÷÷

x=1. 

(148)X﹣25%X=135,

0.75X=135,

0.75X÷0.75=135÷0.75,

X=180;

149X﹣12.5×4=0,

X﹣50=0,

X﹣50+50=0+50,

X=50,

=50÷

X=250

(150)x+×=1,

x+=1,

x+

x

x=

(151) x×()=

x=

x×12=×12,

x=8 

(152)﹣1.5x=1.1,

2﹣1.5x=1.1,

2﹣1.1+1.5x﹣1.5x=1.1﹣1.1+1.5x,

1.5x=0.9,

1.5x÷1.5=0.9÷1.5,

x=0.6;

(153)xx=2,

x=2,

x×2=2×2,

x=4

(154x﹣=

x﹣=

x=

155)x﹣x=15,

x=24 

(156)X÷=

×=×

x=

157(X﹣)=

(X﹣=

x﹣

x=

158X+X=×

x=

x

x=

(159﹣x=

﹣x+x=+x,

+x=

+x﹣=

x=

160)x+0.75﹣=0.15,

x+0.75﹣+=0.15+

x+0.75=0.75,

x+0.75﹣0.75=0.75﹣0.75,

x=0;

161)2x+=4.625,

2x+=4.625﹣

2x=4,

2x÷2=4÷2,

x=2

(162÷4.8x=15.8,

÷4.8x×4.8x=15.8×4.8x,

75.84x=

75.84x÷75.84=÷75.84,

x=

163x=14,

x=14,

x=14

x=12 

(164)x+x=2.1,

x=2.1,

=2.1×

x=1.2;

165)2.7÷120%x=9,

2.7÷1.2x×1.2x=9×1.2x,

2.7=10.8x,

2.7÷10.8=10.8x÷10.8,

x=0.25;

166)(13﹣X)×=6,

(13﹣X)××=6×

13﹣X+X=8+X,

13﹣8=8+X﹣8,

X=5

(167)x﹣21×=4

x﹣14=4 

x﹣14+14=4+14

x=18

x=60.

(168)1x+x=

x=

x=

x=

(168)x×()=

=

=

x=8

(169)2+x=5

2﹣2+x=5﹣2

x=5﹣2

x=2

170)4x﹣=

4x﹣+=+

4x=1,

4x÷4=1÷4,

x= 

(171)x÷=

×=×

x=

172)x﹣x=3

x=3

=3×

x=8

173)6x﹣3.5x=÷

2.5x=×

2.5x=0.75

2.5x÷2.5=0.75÷2.5

x=0.3

(174﹣3X=

﹣3X+3X=+3X

=+3X

=+3X﹣

=3X

÷3=3X÷3

X=

175

x=

=÷

x=

176)5X﹣3×

5X﹣2.1=

5X﹣2.1+2.1=+2.1

5X=3.5

5X÷5=3.5÷5

X=0.7;

177)x××=5

x=5

x=5

x=25

(178χ=

χ=

x=

179χ+χ=

x=

x=

x= 

(180x=

=÷

x=1.8;

181x+15=40

x+15﹣15=40﹣15

x=25

=25÷

x=35;

182)x÷=

×=×

x=

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