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运用乘法运算律进行简便运算:(1)(-76)×(-15)×(-67)×15;(2)(14-16+12)×(-12).
题目详情
运用乘法运算律进行简便运算:
(1)(-
)×(-15)×(-
)×
;
(2)(
-
+
)×(-12).
(1)(-
| 7 |
| 6 |
| 6 |
| 7 |
| 1 |
| 5 |
(2)(
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 2 |
▼优质解答
答案和解析
(1)(-
)×(-15)×(-
)×
=(-
)×(-
)×(-15)×
=1×(-3)
=-3
(2)(
-
+
)×(-12)
=
×(-12)-
×(-12)+
×(-12)
=-3+2-6
=-7
| 7 |
| 6 |
| 6 |
| 7 |
| 1 |
| 5 |
=(-
| 7 |
| 6 |
| 6 |
| 7 |
| 1 |
| 5 |
=1×(-3)
=-3
(2)(
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 2 |
=
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 2 |
=-3+2-6
=-7
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