第六章 实数
6.3__实数__
1.[春·潮安区期末]下列计算正确的是( )
A.9097ad464ca3f4d87bfa261a719ba953.png
C.45aa6d28b88482c4ebcfd7e2776bd9b1.png
2.计算fa0e58cd142a8b887b7f60a77e295010.png
A.4 B.0 C.8 D.12
3.下列实数中,最小的正数是( )
A.10-3dd7975f980cbea8f77f1c0fe26e262c6.png
C.51-10729dc971c19e731d587d4e6bfaaeb630.png
4.-27的立方根与3699fe0c387258682ce98c4065e53637.png
A.0 B.6
C.0或-6 D.-12或6
5.[2016·南陵期中]若a2=9,31eb700c0371fac83281add0ca86722c.png
A.-5 B.-11
C.-5或-11 D.5或11
6.[春·东西湖区期中]计算:
(1)21553867a52c684e18d473467563ea33b.png
(2)|3.14-π|=________;
(3)8a256711fc7404e33e6f3f820af17653.png
7.计算:(1)29097ad464ca3f4d87bfa261a719ba953.png
(2)a74c4ef873eb22c5f153063d628cf438.png
8.(1)[·陕西]3________e3d7922dde6d1771ce9a575632814d61.png
(2)[·海南]3________a74c4ef873eb22c5f153063d628cf438.png
9.计算:
(1)|1553867a52c684e18d473467563ea33b.png
(2)09c33295cfba1426a780256bb6fe3d29.png
word/media/image3_1.png
10.一个数值转换器的原理如图6-3-5所示.当输入的x为256时,输出的y是( )
图6-3-5
A.16 B.1553867a52c684e18d473467563ea33b.png
11.计算:
(1)39097ad464ca3f4d87bfa261a719ba953.png
(2)6aa17cea47851064f0aa05312d96fb28.png
(3)29097ad464ca3f4d87bfa261a719ba953.png
(4)|9097ad464ca3f4d87bfa261a719ba953.png
word/media/image5_1.png
12.我们规定:用[x]表示实数x的整数部分,如[3.14]=3,[d5c8717a199943d0c071fc123e8238ba.png
(1)[84c06b1e77e38ad7f7fa6b3908d2a366.png
(2)求[84c06b1e77e38ad7f7fa6b3908d2a366.png
参考答案
【分层作业】
1.C
2.B
3.C
4.C
5.[C
6.(1)-1553867a52c684e18d473467563ea33b.png
(2)π-3.14
(3)-df4344a8d214cca83c5817f341d32b3d.png
7.(1)6.6
(2) 7.02
8.(1)<
(2) >
9.解:(1)原式=9097ad464ca3f4d87bfa261a719ba953.png
(2)原式=5+3-3=5.
10.B
11.解:(1)原式=-29097ad464ca3f4d87bfa261a719ba953.png
(2)原式=1553867a52c684e18d473467563ea33b.png
(3)原式=-39097ad464ca3f4d87bfa261a719ba953.png
(4)原式=2-9097ad464ca3f4d87bfa261a719ba953.png
12.(1) 9
(2)【解析】(1)∵84c06b1e77e38ad7f7fa6b3908d2a366.png
∴当1≤x<4时,[66f0d9f19c1b01cf4ea57afa77b0b856.png
当4≤x<9时,[66f0d9f19c1b01cf4ea57afa77b0b856.png
∴[84c06b1e77e38ad7f7fa6b3908d2a366.png
解:(2)[84c06b1e77e38ad7f7fa6b3908d2a366.png
=1+1+1+2+2+2+2+…+7
=1×3+2×5+3×7+4×9+5×11+6×13+7
=210.
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