题目内容
列脱式运算下列式子.
(1)(-3)×(-4)-60÷(-12);
(2)-
-
-(-
)-
;
(3)-6+6÷(-2);
(4)(-56)×(-1
)÷(-1
)×
.
(1)(-3)×(-4)-60÷(-12);
(2)-
| 2 |
| 3 |
| 1 |
| 6 |
| 1 |
| 4 |
| 1 |
| 2 |
(3)-6+6÷(-2);
(4)(-56)×(-1
| 5 |
| 16 |
| 3 |
| 4 |
| 4 |
| 7 |
考点:正、负数的运算
专题:运算顺序及法则
分析:根据整数、分数四则运算的计算法则计算即可,注意运算顺序.
解答:
解:(1)(-3)×(-4)-60÷(-12)
=3×4+60÷12
=12+5
=17
(2)-
-
-(-
)-
=-
-
+
-
=-1
(3)-6+6÷(-2)
=-6-6÷2
=-6-3
=-9
(4)(-56)×(-1
)÷(-1
)×
=-56×
×
×
=-24
=3×4+60÷12
=12+5
=17
(2)-
| 2 |
| 3 |
| 1 |
| 6 |
| 1 |
| 4 |
| 1 |
| 2 |
=-
| 8 |
| 12 |
| 2 |
| 12 |
| 3 |
| 12 |
| 6 |
| 12 |
=-1
| 1 |
| 12 |
(3)-6+6÷(-2)
=-6-6÷2
=-6-3
=-9
(4)(-56)×(-1
| 5 |
| 16 |
| 3 |
| 4 |
| 4 |
| 7 |
=-56×
| 21 |
| 16 |
| 4 |
| 7 |
| 4 |
| 7 |
=-24
点评:此题主要考查了正、负数的运算,注意运算顺序.
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