(x+0.9):(x-1.7)=5:3

(x+0.9):(x-1.7)=5:3
解:5×（x-1.7)=3×(x+0.9)
5x-5×1.7=3x+3×0.9
5x-8.5=3x+2.7
5x-3x=2.7+8.5
2x=11.2
x=11.2÷2
x=5.6

(x+0.9):(x-1.7)=5:3
5(x-1.7)=3(x+0.9)
5x-8.5=3x+2.7
5x-3x=2.7+8.5
2x=11.2
x=11.2÷2
x=5.6

(x+0.9):(x-1.7)=5:3
解：原方程可化为
3(x+0.9)=5(x-1.7)
去括号，得
3x+2.7=5x-8.5
移项，得
3x-5x=-8.5-2.7
合并同类项，得
-2x=-11.2
系数化为1，得
x=5.6

5（x-1.7）=3（x+0.9）
5x-8.5=3x+2.7
2x=11.2
x=11.2÷2
x=5.6

(x+0.9):(x-1.7)=5:3
(x+0.9)/(x-1.7)=5/3
(10x+9)/(10x-17)=5/3
3(10x+9)=5(10x-17)
30x+27=50x-85
20x=112
x=28/5