题目内容
脱式计算.
15
-(5
+3
)-4
1
×43×70%-2÷
【2.1+7÷(3
-1
)】×1
(
×5÷
×5)×(1.685÷1
-0.235×
)
1-【4
-(31%-
)×16
】÷1
15
÷63%-【24
-8
×(3
-287.5%)】
15
7 |
29 |
3 |
8 |
22 |
29 |
5 |
8 |
1 |
4 |
4 |
5 |
【2.1+7÷(3
1 |
12 |
5 |
8 |
2 |
3 |
3 |
7 |
3 |
7 |
1 |
4 |
4 |
5 |
1-【4
1 |
3 |
1 |
10 |
2 |
3 |
1 |
5 |
3 |
4 |
2 |
3 |
2 |
3 |
7 |
8 |
分析:根据整数、分数、小数、百分数的四则混合运算进行计算即可得到答案.
解答:解:(1)15
-(5
+3
)-4
=15
-5
-3
-4
,
=15
-3
-(5
+4
),
=11
-10,
=1
;
(2)1
×43×70%-2÷
=53.75×70%-2÷
,
=37.625-2.5,
=35.125;
(3)[2.1+7÷(3
-1
)]×1
=[2.1+7÷
]×1
,
=[2.1+4.8]×1
,
=6.9×1
,
=11.5;
(4)(
×5÷
×5)×(1.685÷1
-0.235×
)
=(
÷
×5)×(1.348-0.188),
=25×1.16,
=29;
(5)1-[4
-(31%-
)×16
]÷1
=1-[4
-0.21×16
]÷1
,
=1-[4
-3
]÷1
,
=1-
÷1
,
=1-
,
=
;
(6)15
÷63%-[24
-8
×(3
-287.5%)]
=15
÷63%-[24
-8
×1],
=15
÷63%-16,
=25-16,
=9.
7 |
29 |
3 |
8 |
22 |
29 |
5 |
8 |
=15
7 |
29 |
3 |
8 |
22 |
29 |
5 |
8 |
=15
7 |
29 |
22 |
29 |
3 |
8 |
5 |
8 |
=11
14 |
29 |
=1
14 |
29 |
(2)1
1 |
4 |
4 |
5 |
=53.75×70%-2÷
4 |
5 |
=37.625-2.5,
=35.125;
(3)[2.1+7÷(3
1 |
12 |
5 |
8 |
2 |
3 |
=[2.1+7÷
35 |
24 |
2 |
3 |
=[2.1+4.8]×1
2 |
3 |
=6.9×1
2 |
3 |
=11.5;
(4)(
3 |
7 |
3 |
7 |
1 |
4 |
4 |
5 |
=(
15 |
7 |
3 |
7 |
=25×1.16,
=29;
(5)1-[4
1 |
3 |
1 |
10 |
2 |
3 |
1 |
5 |
=1-[4
1 |
3 |
2 |
3 |
1 |
5 |
=1-[4
1 |
3 |
1 |
2 |
1 |
5 |
=1-
5 |
6 |
1 |
5 |
=1-
25 |
36 |
=
11 |
36 |
(6)15
3 |
4 |
2 |
3 |
2 |
3 |
7 |
8 |
=15
3 |
4 |
2 |
3 |
2 |
3 |
=15
3 |
4 |
=25-16,
=9.
点评:此题主要考查的是整数、分数、小数、百分数的四则混合运算.
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