题目内容
计算下面各题,能简算的要简算.
(1)
÷
+
÷
(2)(
+
+
)÷
(3)137×
(4)(
-
)×36.
(1)
7 |
2 |
5 |
4 |
15 |
2 |
5 |
4 |
(2)(
1 |
3 |
1 |
4 |
1 |
6 |
1 |
24 |
(3)137×
9 |
136 |
(4)(
11 |
12 |
1 |
4 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)先把除号变成乘号,再根据乘法的分配律简算;
(2)先把除号变成乘号,再根据乘法的分配律简算;
(3)先把137拆分为136+1,再根据乘法的分配律简算;
(4)根据乘法的分配律简算.
(2)先把除号变成乘号,再根据乘法的分配律简算;
(3)先把137拆分为136+1,再根据乘法的分配律简算;
(4)根据乘法的分配律简算.
解答:
解:(1)
÷
+
÷
=(
+
)×
=11×
=
(2)(
+
+
)÷
=
×24+
×24+
×24
=8+6+4
=18
(3)137×
=(136+1)×
=136×
+1×
=9
(4)(
-
)×36
=
×36-
×36
=33-9
=24
7 |
2 |
5 |
4 |
15 |
2 |
5 |
4 |
=(
7 |
2 |
15 |
2 |
4 |
5 |
=11×
4 |
5 |
=
44 |
5 |
(2)(
1 |
3 |
1 |
4 |
1 |
6 |
1 |
24 |
=
1 |
3 |
1 |
4 |
1 |
6 |
=8+6+4
=18
(3)137×
9 |
136 |
=(136+1)×
9 |
136 |
=136×
9 |
136 |
9 |
136 |
=9
9 |
136 |
(4)(
11 |
12 |
1 |
4 |
=
11 |
12 |
1 |
4 |
=33-9
=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律简便计算.
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