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脱式计算(能简算的要写出主要的简算过程).(1)3200-1200÷36×14(2)12.5×0.25×3.2(3)57×34+14÷75(4)(34-38)×(35÷310)(5)9.24÷[1.5×(0.76-0.56)].

题目详情
脱式计算(能简算的要写出主要的简算过程).
(1)3200-1200÷36×14
(2)12.5×0.25×3.2
(3)
5
7
×
3
4
+
1
4
÷
7
5

(4)(
3
4
-
3
8
)×(
3
5
÷
3
10

(5)9.24÷[1.5×(0.76-0.56)].
▼优质解答
答案和解析
(1)3200-1200÷36×14
=3200-
100
3
×14
=3200-
1400
3

=
8200
3


(2)12.5×0.25×3.2
=12.5×0.25×(4×0.8)
=(12.5×0.8)×(0.25×4)
=10×1
=10;

(3)
5
7
×
3
4
+
1
4
÷
7
5

=
5
7
×
3
4
+
1
4
×
5
7

=
5
7
×(
3
4
+
1
4

=
5
7
×1
=
5
7


(4)(
3
4
-
3
8
)×(
3
5
÷
3
10

=
3
8
×2
=
3
4


(5)9.24÷[1.5×(0.76-0.56)]
=9.24÷[1.5×0.2)]
=9.24÷0.3
=30.8.