题目内容
能简便的用简便方法计算.
÷
×
;
÷(
+
);
×
+
÷5.
| 10 |
| 13 |
| 35 |
| 26 |
| 7 |
| 3 |
| 5 |
| 8 |
| 3 |
| 4 |
| 1 |
| 2 |
| 1 |
| 5 |
| 4 |
| 7 |
| 3 |
| 7 |
考点:分数的四则混合运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:(1)把除以
化成乘以
,直接约分计算即可;
(2)先算小括号里的加法,再算括号外的除法;
(3)把除以5化成乘以
,再运用乘法的分配律进行简算.
| 35 |
| 26 |
| 26 |
| 35 |
(2)先算小括号里的加法,再算括号外的除法;
(3)把除以5化成乘以
| 1 |
| 5 |
解答:
解:(1)
÷
×
=
×
×
=
=
;
(2)
÷(
+
)
=
÷
=
;
(3)
×
+
÷5
=
×
+
×
=
×(
+
)
=
×1
=
.
| 10 |
| 13 |
| 35 |
| 26 |
| 7 |
| 3 |
=
| 10 |
| 13 |
| 26 |
| 35 |
| 7 |
| 3 |
=
| 10×26×7 |
| 13×35×3 |
=
| 4 |
| 3 |
(2)
| 5 |
| 8 |
| 3 |
| 4 |
| 1 |
| 2 |
=
| 5 |
| 8 |
| 5 |
| 4 |
=
| 1 |
| 2 |
(3)
| 1 |
| 5 |
| 4 |
| 7 |
| 3 |
| 7 |
=
| 1 |
| 5 |
| 4 |
| 7 |
| 3 |
| 7 |
| 1 |
| 5 |
=
| 1 |
| 5 |
| 4 |
| 7 |
| 3 |
| 7 |
=
| 1 |
| 5 |
=
| 1 |
| 5 |
点评:本题考查了分数四则混合运算,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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