题目内容

脱式计算.
15
7
29
-(5
3
8
+3
22
29
)-4
5
8
                      1
1
4
×43×70%-2÷
4
5

【2.1+7÷(3
1
12
-1
5
8
)】×1
2
3
               (
3
7
×5÷
3
7
×5)×(1.685÷1
1
4
-0.235×
4
5

1-【4
1
3
-(31%-
1
10
)×16
2
3
】÷1
1
5
            15
3
4
÷63%-【24
2
3
-8
2
3
×(3
7
8
-287.5%)】
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
7
29
-(5
3
8
+3
22
29
)-4
5
8

=15
7
29
-5
3
8
-3
22
29
-4
5
8

=15
7
29
-3
22
29
-(5
3
8
+4
5
8
),
=11
14
29
-10,
=1
14
29


(2)1
1
4
×43×70%-2÷
4
5

=53.75×70%-2÷
4
5

=37.625-2.5,
=35.125;

(3)[2.1+7÷(3
1
12
-1
5
8
)]×1
2
3

=[2.1+7÷
35
24
]×1
2
3

=[2.1+4.8]×1
2
3

=6.9×1
2
3

=11.5;

(4)(
3
7
×5÷
3
7
×5)×(1.685÷1
1
4
-0.235×
4
5

=(
15
7
÷
3
7
×5)×(1.348-0.188),
=25×1.16,
=29;

(5)1-[4
1
3
-(31%-
1
10
)×16
2
3
]÷1
1
5

=1-[4
1
3
-0.21×16
2
3
]÷1
1
5

=1-[4
1
3
-3
1
2
]÷1
1
5

=1-
5
6
÷1
1
5

=1-
25
36

=
11
36


(6)15
3
4
÷63%-[24
2
3
-8
2
3
×(3
7
8
-287.5%)]
=15
3
4
÷63%-[24
2
3
-8
2
3
×1],
=15
3
4
÷63%-16,
=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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