题目内容
计算:
①-3×23-(-3×2)2+(-23×3);
②
÷(-2
)-
÷(-1
)-0.5÷2×
;
③(-10)2+[(-2)2-(3+32)×2];
④[
÷(-
)+0.4×(-
)2]×(-1)5.
①-3×23-(-3×2)2+(-23×3);
②
| 2 |
| 5 |
| 2 |
| 5 |
| 21 |
| 8 |
| 3 |
| 4 |
| 1 |
| 2 |
③(-10)2+[(-2)2-(3+32)×2];
④[
| 15 |
| 4 |
| 1 |
| 4 |
| 5 |
| 2 |
①原式=-3×8-36-8×3=-84;
②原式=
÷(-
)-
÷(-
)-
×
×
=
×(-
)-
×(-
)-
×
×
=-
+
-
=
;
③原式=100+4-(3+9)×2=104-24=80;
④原式=(-
×4+
×
)×(-1)=(-15+2.5)×(-1)=12.5.
②原式=
| 2 |
| 5 |
| 12 |
| 5 |
| 21 |
| 8 |
| 7 |
| 4 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
=
| 2 |
| 5 |
| 5 |
| 12 |
| 21 |
| 8 |
| 4 |
| 7 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
=-
| 1 |
| 6 |
| 3 |
| 2 |
| 1 |
| 8 |
=
| 29 |
| 24 |
③原式=100+4-(3+9)×2=104-24=80;
④原式=(-
| 15 |
| 4 |
| 2 |
| 5 |
| 25 |
| 4 |
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