
计算:(1)-0.5+(-15)-(-17)-|-12|;(2)-(-2)×(-3);(3)(12-3+56-712))÷(-136);
计算:(1)-0.5+(-15)-(-17)-|-12|;(2)-(-2)×(-3);(3)(12-3+56-712))÷(-136);(4)-1.6÷[(-23)2×(...
计算:(1)-0.5+(-15)-(-17)-|-12|;(2)-(-2)×(-3);(3)(12-3+56-712))÷(-136); (4)-1.6÷[(-23)2×(-3)3-22];(5)-14+〔1-(1-0.5×2)〕÷|2-(-3)2|;(6)20×(56÷49)×(-2)4.
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(1)原式=-0.5-15+17-12
=-10.5;
(2)原式=-6;
(3)原式=
×(-36)-3×(-36)+
×(-36)-
×(-36)
=-18+108-30+21
=81;
(4)原式=-1.6÷[
×(-27)-4]
=-1.6÷(-16);
=
;
(5)原式=-1+[1-(1-1)]÷|2-9|
=-1+1÷7
=-
;
(6)原式=20×(
×
)×16
=600.
=-10.5;
(2)原式=-6;
(3)原式=
1 |
2 |
5 |
6 |
7 |
12 |
=-18+108-30+21
=81;
(4)原式=-1.6÷[
4 |
9 |
=-1.6÷(-16);
=
1 |
10 |
(5)原式=-1+[1-(1-1)]÷|2-9|
=-1+1÷7
=-
6 |
7 |
(6)原式=20×(
5 |
6 |
9 |
4 |
=600.
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