问题
解答题
计算: ①8+(-10)+(-2)-(-5); ②2
③8×(-
④18×(-
⑤(
⑥(-
⑦(-
⑧(-1)2008+(-5)×[(-2)3+2]-(-4)2÷(-
|
答案
①原式=8-10-2+5
=13-12
=1;
②原式=2
-31 7
-31 7
-52 3 1 3
=-1-9
=-10;
③原式=-8×
×4 5 1 16
=-
;2 5
④原式=-12+(13-4)×2 3
=-12+9×2 3
=-12+6
=-6;
⑤原式=-
×36+1 2
×36-5 9
×367 12
=-18+20-21
=-19;
⑥原式=-
×3 4
×3 8
×16 9 1 8
=-
;1 16
⑦原式=-
×16-0.25×5×645 8
=-10-80
=-90;
⑧原式=1-5×(-8+2)-16÷(-
)1 2
=1-5×(-6)+32
=1+30+32
=63.