题目内容
计算下面各题,能简算的要简算.
(1)(
+
)×
;
(2)(44+
)÷
;
(3)
×
×25×32;
(4)
×
+
÷4.
(1)(
| 4 |
| 5 |
| 1 |
| 125 |
| 5 |
| 4 |
(2)(44+
| 11 |
| 12 |
| 11 |
| 12 |
(3)
| 1 |
| 8 |
| 13 |
| 100 |
(4)
| 7 |
| 24 |
| 3 |
| 4 |
| 7 |
| 24 |
考点:分数的四则混合运算,分数的简便计算
专题:运算顺序及法则
分析:(1)根据乘法分配律简便计算;
(2)先变形为(44+
)×
,再根据乘法分配律简便计算;
(3)变形为(
×8)×(
×25×4),再约分计算;
(4)先变形为
×
+
×
,再根据乘法分配律简便计算.
(2)先变形为(44+
| 11 |
| 12 |
| 12 |
| 11 |
(3)变形为(
| 1 |
| 8 |
| 13 |
| 100 |
(4)先变形为
| 7 |
| 24 |
| 3 |
| 4 |
| 7 |
| 24 |
| 1 |
| 4 |
解答:
解:(1)(
+
)×
=
×
+
×
=1+
=1
;
(2)(44+
)÷
=(44+
)×
=44×
+
×
=48+1
=49;
(3)
×
×25×32
=(
×8)×(
×25×4)
=1×13
=13;
(4)
×
+
÷4
=
×
+
×
=
×(
+
)
=
×1
=
.
| 4 |
| 5 |
| 1 |
| 125 |
| 5 |
| 4 |
=
| 4 |
| 5 |
| 5 |
| 4 |
| 1 |
| 125 |
| 5 |
| 4 |
=1+
| 1 |
| 100 |
=1
| 1 |
| 100 |
(2)(44+
| 11 |
| 12 |
| 11 |
| 12 |
=(44+
| 11 |
| 12 |
| 12 |
| 11 |
=44×
| 12 |
| 11 |
| 11 |
| 12 |
| 12 |
| 11 |
=48+1
=49;
(3)
| 1 |
| 8 |
| 13 |
| 100 |
=(
| 1 |
| 8 |
| 13 |
| 100 |
=1×13
=13;
(4)
| 7 |
| 24 |
| 3 |
| 4 |
| 7 |
| 24 |
=
| 7 |
| 24 |
| 3 |
| 4 |
| 7 |
| 24 |
| 1 |
| 4 |
=
| 7 |
| 24 |
| 3 |
| 4 |
| 1 |
| 4 |
=
| 7 |
| 24 |
=
| 7 |
| 24 |
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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