(1)12:(x+2)=5:x
12x=5(x+2)
12x=5x+10
7x=10
x=10/7 (7分之10)
(2)(8x-10):(3x+5)=2:3
3(8x-10)=2(3x+5)
24x-30=6x+10
24x-6x=10+30
18x=40
x=20/9 (9分之20)
(1)12:(x+2)=5:x
12x=5(x+2)
12x=5x+10
7x=10
x=10/7 (7分之10)
(2)(8x-10):(3x+5)=2:3
3(8x-10)=2(3x+5)
24x-30=6x+10
24x-6x=10+30
18x=40
x=20/9 (9分之20)