题目内容
脱式计算.
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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)(2)(3)把除法改为乘法,直接约分计算即可;
(4)先算加法,再算括号里面的乘法,最后算括号外面的乘法;
(5)先算加法,再算除法,最后算乘法;
(6)先算小括号里面的减法,再算中括号里面的减法,最后算乘法.
(4)先算加法,再算括号里面的乘法,最后算括号外面的乘法;
(5)先算加法,再算除法,最后算乘法;
(6)先算小括号里面的减法,再算中括号里面的减法,最后算乘法.
解答:
解:(1)
÷
÷
=
×
×
=
;
(2)
×
÷
=
×
×2
=
;
(3)
÷5×
=
×
×
=
;
(4)
×[
×(
+
)]
=
×[
×
]
=
×
=
;
(5)
×[(
+
)÷
]
=
×[
×24]
=
×29
=1;
(6)[
-(
-
)]×
=[
-
]×
=
×
=
.
| 3 |
| 4 |
| 3 |
| 5 |
| 5 |
| 6 |
=
| 3 |
| 4 |
| 5 |
| 3 |
| 6 |
| 5 |
=
| 3 |
| 2 |
(2)
| 5 |
| 9 |
| 3 |
| 10 |
| 1 |
| 2 |
=
| 5 |
| 9 |
| 3 |
| 10 |
=
| 1 |
| 3 |
(3)
| 5 |
| 9 |
| 4 |
| 7 |
=
| 5 |
| 9 |
| 1 |
| 5 |
| 4 |
| 7 |
=
| 4 |
| 63 |
(4)
| 23 |
| 100 |
| 4 |
| 5 |
| 3 |
| 8 |
| 1 |
| 5 |
=
| 23 |
| 100 |
| 4 |
| 5 |
| 23 |
| 40 |
=
| 23 |
| 100 |
| 23 |
| 50 |
=
| 529 |
| 5000 |
(5)
| 1 |
| 29 |
| 5 |
| 6 |
| 3 |
| 8 |
| 1 |
| 24 |
=
| 1 |
| 29 |
| 29 |
| 24 |
=
| 1 |
| 29 |
=1;
(6)[
| 2 |
| 5 |
| 3 |
| 5 |
| 1 |
| 4 |
| 2 |
| 3 |
=[
| 2 |
| 5 |
| 7 |
| 20 |
| 2 |
| 3 |
=
| 1 |
| 20 |
| 2 |
| 3 |
=
| 1 |
| 30 |
点评:分数四则混合运算的关键是抓住运算顺序,正确按运算顺序计算即可.
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