题目内容
用你喜欢的方法计算
×(
+
)
13×
+2÷
+
12÷(
×4+
×4).
| 8 |
| 9 |
| 1 |
| 4 |
| 3 |
| 8 |
13×
| 3 |
| 4 |
| 4 |
| 3 |
| 3 |
| 4 |
12÷(
| 4 |
| 5 |
| 6 |
| 5 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)根据乘法分配律进行简算;
(2)根据乘法分配律进行简算;
(3)小括号里面根据乘法分配律进行简算,最后算除法.
(2)根据乘法分配律进行简算;
(3)小括号里面根据乘法分配律进行简算,最后算除法.
解答:
解:(1)
×(
+
)
=
×
+
×
=
+
=
;
(2)13×
+2÷
+
=13×
+2×
+
=(13+2+1)×
=16×
=12;
(3)12÷(
×4+
×4)
=12÷[(
+
)×4]
=12÷[2×4]
=12÷8
=1.5.
| 8 |
| 9 |
| 1 |
| 4 |
| 3 |
| 8 |
=
| 8 |
| 9 |
| 1 |
| 4 |
| 8 |
| 9 |
| 3 |
| 8 |
=
| 2 |
| 9 |
| 1 |
| 3 |
=
| 5 |
| 9 |
(2)13×
| 3 |
| 4 |
| 4 |
| 3 |
| 3 |
| 4 |
=13×
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
=(13+2+1)×
| 3 |
| 4 |
=16×
| 3 |
| 4 |
=12;
(3)12÷(
| 4 |
| 5 |
| 6 |
| 5 |
=12÷[(
| 4 |
| 5 |
| 6 |
| 5 |
=12÷[2×4]
=12÷8
=1.5.
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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