问题 解答题
x+
7
9
x=
4
3

2x+30%x=9.2
6.5:x=3.25:4
1
2
1
5
=
3
4
:x.
答案

(1)x+

7
9
x=
4
3

(1+

7
9
)x=
4
3

16
9
x=
4
3

16
9
9
16
=
4
3
×
9
16

x=

3
4

(2)2x+30%x=9.2,

(2+30%)x=9.2,

2.3x=9.2,

2.3x÷2.3=9.2÷2.3,

x=4;

(3)6.5:x=3.25:4,

3.25x=6.5×4,

3.25x÷3.25=26÷3.25,

x=8;

(4)

1
2
1
5
=
3
4
:x,

1
2
x=
1
5
×
3
4

1
2
x×2=
3
20
×2,

x=

3
10

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