题目内容

736÷16+52220×(0.51-0.31)12.5-0.625-
3
8
2
9
×[
3
4
-(
7
16
-
1
4
)]
解方程x-
1
4
x=
3
8
解比例21:x=4:
1
3
解;(1)736÷16+52,
=46+52,
=98;

(2)220×(0.51-0.31),
=220×0.2,
=44;

(3)12.5-0.625-
3
8

=12.5-(0.625+
3
8
),
=12.5-1,
=11.5;


(4)
2
9
×[
3
4
-(
7
16
-
1
4
)],
=
2
9
×[
3
4
-
3
16
],
=
2
9
×
9
16

=
1
8


(5)x-
1
4
x=
3
8

3
4
x=
3
8

3
4
3
4
=
3
8
÷
3
4

x=
1
2


(6)21:x=4:
1
3

4x=21×
1
3

4x÷4=7÷4,
x=
7
4
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