题目内容
计算下面各题.
|
(
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|
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分析:(1)先算乘除,再算加法;
(2)两个括号同时计算,再算乘法;
(3)先算括号内的,把除法变为乘法,约分计算;
(4)把除法变为乘法,运用乘法分配律简算.
(2)两个括号同时计算,再算乘法;
(3)先算括号内的,把除法变为乘法,约分计算;
(4)把除法变为乘法,运用乘法分配律简算.
解答:解:(1)
×
+
÷
=
+
×
=
+2
=2
(2)(
-
)×(1-
)
=
×
=
(3)
×(
-
)÷
=
×
×
=
(4)
÷
-
×
=
×
-
×
=
×(
-
)
=
×
=
1 |
3 |
3 |
7 |
5 |
6 |
5 |
12 |
=
1 |
7 |
5 |
6 |
12 |
5 |
=
1 |
7 |
=2
1 |
7 |
(2)(
11 |
12 |
1 |
4 |
2 |
3 |
=
2 |
3 |
1 |
3 |
=
2 |
9 |
(3)
3 |
4 |
2 |
3 |
2 |
5 |
4 |
11 |
=
3 |
4 |
4 |
15 |
11 |
4 |
=
11 |
20 |
(4)
4 |
5 |
7 |
4 |
4 |
5 |
3 |
7 |
=
4 |
5 |
4 |
7 |
4 |
5 |
3 |
7 |
=
4 |
5 |
4 |
7 |
3 |
7 |
=
4 |
5 |
1 |
7 |
=
4 |
35 |
点评:此题考查了分数的四则混合运算,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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