题目内容
简便计算.
-
+
-
÷
-
×
.
| 3 |
| 10 |
| 1 |
| 4 |
| 7 |
| 10 |
| 3 |
| 4 |
| 5 |
| 8 |
| 3 |
| 5 |
| 3 |
| 5 |
| 1 |
| 8 |
考点:分数的简便计算
专题:运算定律及简算
分析:(1)根据加法交换律和结合律进行简算;
(2)先算除法和乘法,再算减法.
(2)先算除法和乘法,再算减法.
解答:
解:(1)
-
+
-
=(
+
)-(
+
)
=1-1
=0;
(2)
÷
-
×
=
-
=
.
| 3 |
| 10 |
| 1 |
| 4 |
| 7 |
| 10 |
| 3 |
| 4 |
=(
| 3 |
| 10 |
| 7 |
| 10 |
| 1 |
| 4 |
| 3 |
| 4 |
=1-1
=0;
(2)
| 5 |
| 8 |
| 3 |
| 5 |
| 3 |
| 5 |
| 1 |
| 8 |
=
| 25 |
| 24 |
| 3 |
| 40 |
=
| 29 |
| 30 |
点评:考查了运算定律与简便运算,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简便计算.
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