题目内容
计算:(1)-3+5.3+7-5.3;
(2)(-2)×
÷(-
)×4;
(3)(
-
+
)×(-42);
(4)-16-|-5|+2×(-
)2.
(2)(-2)×
| 3 |
| 2 |
| 3 |
| 4 |
(3)(
| 1 |
| 3 |
| 5 |
| 21 |
| 3 |
| 14 |
(4)-16-|-5|+2×(-
| 1 |
| 2 |
(1)-3+5.3+7-5.3=(-3+7)+(5.3-5.3)=4;
(2)(-2)×
÷(-
)×4=-3×(-
)×4=16;
(3)(
-
+
)×(-42)=
×(-42)-
×(-42)+
×(-42)=(-14)-(-10)+(-9)=-13;
(4)-16-|-5|+2×(-
)2=-1-5+2×
=-5
;
(2)(-2)×
| 3 |
| 2 |
| 3 |
| 4 |
| 4 |
| 3 |
(3)(
| 1 |
| 3 |
| 5 |
| 21 |
| 3 |
| 14 |
| 1 |
| 3 |
| 5 |
| 21 |
| 3 |
| 14 |
(4)-16-|-5|+2×(-
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 2 |
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