题目内容
计算下面各题
|
|
| ||||||||||||||||||
(
| (1+
|
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考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)可通过约分计算.
(2)可根据一个数除以两个数,等于用这个数除以这两个数的积的除法性质计算.
(3)可先算乘法与除法,再算加法.
(4)(5)可先算括号中的减法与加法,再算除法.
(6)先算除法,再算乘法.
(2)可根据一个数除以两个数,等于用这个数除以这两个数的积的除法性质计算.
(3)可先算乘法与除法,再算加法.
(4)(5)可先算括号中的减法与加法,再算除法.
(6)先算除法,再算乘法.
解答:
解:(1)
×
=
;
(2)
÷
÷
=
÷(
×
)
=
÷
=
;
(3)
×
+
÷4
=
+
=
;
(4)(
-
)÷(
+
)
=
÷
=
;
(5)(1+
)÷(1-
)
=
÷
=3;
(6)
÷
×
=
×
=
.
11 |
12 |
18 |
55 |
3 |
10 |
(2)
7 |
36 |
11 |
12 |
5 |
33 |
=
7 |
36 |
11 |
12 |
5 |
33 |
=
7 |
36 |
5 |
36 |
=
7 |
5 |
(3)
6 |
7 |
2 |
3 |
8 |
9 |
=
4 |
7 |
2 |
9 |
=
50 |
63 |
(4)(
8 |
15 |
9 |
20 |
3 |
4 |
1 |
2 |
=
1 |
12 |
5 |
4 |
=
1 |
15 |
(5)(1+
1 |
2 |
1 |
2 |
=
3 |
2 |
1 |
2 |
=3;
(6)
2 |
5 |
7 |
20 |
7 |
10 |
=
8 |
7 |
7 |
10 |
=
4 |
5 |
点评:四则混合运算的运算顺序:先算乘除,再算加减,有括号的要先算括号里面的.
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