题目内容
简便计算:
|
|
分析:(1)根据减法的性质简算;
(2)先把除法变成乘法,再根据乘法分配律简算.
(2)先把除法变成乘法,再根据乘法分配律简算.
解答:解:(1)
-
-
=
-(
+
)
=
-1
=
;
(2)
×
+
÷
=
×
+
×
=(
+
)×
=1×
=
.
| 7 |
| 4 |
| 5 |
| 12 |
| 7 |
| 12 |
=
| 7 |
| 4 |
| 5 |
| 12 |
| 7 |
| 12 |
=
| 7 |
| 4 |
=
| 3 |
| 4 |
(2)
| 8 |
| 11 |
| 5 |
| 9 |
| 5 |
| 9 |
| 11 |
| 3 |
=
| 8 |
| 11 |
| 5 |
| 9 |
| 5 |
| 9 |
| 3 |
| 11 |
=(
| 8 |
| 11 |
| 3 |
| 11 |
| 5 |
| 9 |
=1×
| 5 |
| 9 |
=
| 5 |
| 9 |
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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