题目内容
脱式计算
(1)[1-(
+
)]÷
(2)
÷[32×(1-
)+
]
(3)[
-(
+
×50%)]÷
(4)(9.3×
-7.3)÷
.
(1)[1-(
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 3 |
(2)
| 39 |
| 5 |
| 5 |
| 8 |
| 18 |
| 5 |
(3)[
| 7 |
| 10 |
| 1 |
| 2 |
| 2 |
| 5 |
| 16 |
| 7 |
(4)(9.3×
| 5 |
| 6 |
| 9 |
| 4 |
考点:整数、分数、小数、百分数四则混合运算
专题:运算顺序及法则
分析:(1)先算加法,再算减法,最后算除法;
(2)先算减法,再算加法,再算乘法,最后算除法;
(3)先算加法,再算乘法,再算减法,最后算除法;
(4)先算乘法,再算减法,最后算除法.
(2)先算减法,再算加法,再算乘法,最后算除法;
(3)先算加法,再算乘法,再算减法,最后算除法;
(4)先算乘法,再算减法,最后算除法.
解答:
解:(1)[1-(
+
)]÷
=[1-
]÷
=
÷
=1;
(2)
÷[32×(1-
)+
]
=
÷〔32×
+
〕
=
÷〔12+
〕
=
÷
=
;
(3)[
-(
+
×50%)]÷
=[
-(
+
)]÷
=〔
-
〕÷
=0;
(4)(9.3×
-7.3)÷
=(7.75-7.3)÷
=0.45÷
=0.2.
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 3 |
=[1-
| 2 |
| 3 |
| 1 |
| 3 |
=
| 1 |
| 3 |
| 1 |
| 3 |
=1;
(2)
| 39 |
| 5 |
| 5 |
| 8 |
| 18 |
| 5 |
=
| 39 |
| 5 |
| 3 |
| 8 |
| 18 |
| 5 |
=
| 39 |
| 5 |
| 18 |
| 5 |
=
| 39 |
| 5 |
| 78 |
| 5 |
=
| 1 |
| 2 |
(3)[
| 7 |
| 10 |
| 1 |
| 2 |
| 2 |
| 5 |
| 16 |
| 7 |
=[
| 7 |
| 10 |
| 1 |
| 2 |
| 1 |
| 5 |
| 16 |
| 7 |
=〔
| 7 |
| 10 |
| 7 |
| 10 |
| 16 |
| 7 |
=0;
(4)(9.3×
| 5 |
| 6 |
| 9 |
| 4 |
=(7.75-7.3)÷
| 9 |
| 4 |
=0.45÷
| 9 |
| 4 |
=0.2.
点评:考查了分数、小数和百分数的四则混合运算,注意运算顺序和运算法则,然后再进一步计算.
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