问题 解答题
正确、合理、灵活的计算下面各题.
①(1.75×0.2+1.75×0.8)÷17.5     
②10
1
4
-(6
1
4
-2
1
5

③243×8
1
4
+75.7×82.5    
3
8
×1
1
4
+125%+0.625×1.25
⑤0.91÷
4
5
+1.25×10.9    
⑥(
5
6
+
7
8
-
5
12
)÷
1
24
答案

(1)(1.75×0.2+1.75×0.8)÷17.5,

=1.75×(0.2+0.8)÷17.5,

=1.75×1÷17.5,

=1.75÷17.5,

=0.1;

(2)10

1
4
-(6
1
4
-2
1
5
),

=10

1
4
-6
1
4
+2
1
5

=4+2

1
5

=6

1
5

(3)243×8

1
4
+75.7×82.5,

=(24.3+75.7)×82.5,

=100×82.5,

=8250;

(4)

3
8
×1
1
4
+125%+0.625×1.25,

=1.25×(

3
8
+1+0.625),

=1.25×2,

=2.5;

(5)0.91÷

4
5
+1.25×10.9,

=1.25×(0.91+10.9),

=1.25×11.81,

=14.7625;

(6)(

5
6
+
7
8
-
5
12
)÷
1
24

=

5
6
×24+
7
8
×24-
5
12
×24,

=20+21-10,

=31.

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