问题 解答题
解方程.
(1)
8
9
=
5
6
(2)
3
4
x-
2
3
x=
1
12
(3)
4
5
x÷2=
7
16
(4)x-15%x=37.4.
答案

(1)x×

8
9
=
5
6

8
9
÷
8
9
=
5
6
÷
8
9

x=

15
16

(2)

3
4
x-
2
3
x=
1
12

x(

3
4
-
2
3
)=
1
12

1
12
x=
1
12

1
12
1
12
=
1
12
÷
1
12

x=1;

(3)

4
5
x÷2=
7
16

4
5
x÷2×2=
7
16
×2,

4
5
x=
7
8

4
5
4
5
=
7
8
÷
4
5

x=

35
32

(4)x-15%x=37.4,

x(1-0.15)=37.4,

0.85x=37.4,

0.85x÷0.85=37.4÷0.85,

x=44.

解答题
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