问题 解答题
解方程.
2
3
X=
2
5

x-1.4+1.6=3
3
20
:18%=
6.5
x
答案

(1)4÷

2
3
X=
2
5

3
2
X=
2
5

6X=

2
5

6X÷6=

2
5
÷6,

X=

2
5
×
1
6

X=

1
15

(2)x-1.4+1.6=3,

x+(1.6-1.4)=3,

x+0.2=3,

x+0.2-0.2=3-0.2,

x=2.8;

(3)

3
20
:18%=
6.5
x

5:6=6.5:x,

5x=6×6.5,

5x=39,

5x÷5=39÷5,

x=

39
5

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