求未知数X专项练习(90题)
(1)χ+2.4χ=6 (2)3.5: χ=5:4.2
(3)1.8χ-χ=2.4 (4) =
(5)6×3-1.8χ=7.2 (6)17-5χ=2.4+3
(7) = (8) χ-χ=
(9)12.6×-2χ=8 (10) =
(11)×-χ= (12) χ+50%=42
(13)4χ-13=31 (14)4.5+8χ=27
(15)2χ+4.3×3=14 (16) χ×(1-)=1
(17)χ-χ= (18)3÷4χ=2.5
(19)= (20)1.6:χ=:
(21)3χ-16×3=102 (22)x:1=:
(23)4χ+7.1=12.5 (24)χ:0.6=:4
(25):=:χ (26) 0.3χ-2=9.1
(27)= (28) x-=
(29) χ:=: (30): χ=:
(31)3χ+χ=2 (32):=0.3: χ
(33)131-χ=89.2 (34):0.25=80%: χ
(35)4χ+7.1=12.5 (36)-χ=
(37)χ-χ+= (38):=χ:12
(39) χ-χ= (40) χ: =12:3
(41)2.4χ-0.45×2=0.3 (42)X-0.8=10
(43)12+X=72 (44)12X+1.5=5.1
(45) X-X= (46)0.4:0.8=9:X
(47) 10:X=4:7 (48)
(49) (50)(x+4)÷5=6
(51) 1.2×(x+5)=14.4 (52)4.2x÷1.6-14=0.175
(53)(10-7.5)x=0.125×8 (54) 5x-20%x=19.2
(55)81x-342=76(x-2) (56)0.3x+7x-0.25x=21.15
(57)0.5 (58)2.2:3.3=X:10
(59): =χ:0.1 (60)6.3-5χ=4.1
(61)1.25:5=0.75:χ (62):χ=:6
(63)×2.5-χ=0.6 (64) χ-χ=
(65): χ=: (66) =
(67)χ-χ+1.2=3.4 (68)4:6=15:χ
(69): =χ: (70)3.5X+1.8=12.3
(71)X+X=21 (72) X+X=
(73) 3.6X÷2=2.16 (74) X+X=
(75)0.8X-4=1.6 (76)5X÷2=10
(77) X-0.25X=3 (78) X-X=
(79)X-= (80)2X+7X=
(81)+X= (82) X=
(83) X= (84) X=10
(85)2X-X= (86) X- X=
(87)2X + = (88)70%X + 20%X = 3.6
(89) x- 25%x = 10 (90) X×(+)=
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