计算下列各题(要求写出解题关键步骤):(1)[(-4)-(+7)]-(-5)(2)-3+12-7+8-31-9(3)3-2×(-5
计算下列各题(要求写出解题关键步骤):(1)[(-4)-(+7)]-(-5)(2)-3+12-7+8-31-9(3)3-2×(-5)2(4)-22-(-3)3×(-1)4...
计算下列各题(要求写出解题关键步骤):(1)[(-4)-(+7)]-(-5)(2)-3+12-7+8-31-9(3)3-2×(-5)2(4)-22-(-3)3×(-1)4-(-1)5(5)(512+23?34)×(?12)(6)?24÷49×(?32)2(7)16÷(?2)3?(?18)×(?4)(8)(?523)×(?34)?523×17?523×(?6).
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威尔G47GF79
2015-02-09
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(1)原式=-4-7+5
=-6;
(2)原式=)-3-7-31-9+12+8
=-50+20
=-30,
(3)原式=3-2×25
=3-50
=-47,
(4)原式=-4-(-27)×1-(-1)
=-4+27+1
=24;
(5)-12×
(+?)=-
(×12+×12?×12)=-(5+8-9)
=-4;
(6)原式=-16×
×
=-81,;
(7)原式=16÷(-8)-
=-2-
=-2
;
(8)原式=
×34?×17?×(?6)=
(34-17+6)
=
×23
=5
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