题目内容
计算下面各题
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|
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(
| (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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