解方程.4÷ 2 3 X= 2 5 x-1.4+1.6=3

解方程.4÷ 2 3 X= 2 5 x-1.4+1.6=3 3 20 :18%= 6.5 x .
2026-05-20 23:04:07
推荐回答(1个)
回答1:

(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