原式: (x+2)/(x-5) =7/88(x+2)=7(x-15)8x+16=7x-1058x-7x=-105-16x=-121
7(x-15)=8(x+2)x=-121
x—15分之x+2=8分之78(x+2)=7(x-15)8x+16=7x-1058x-7x=-105-16x=-121
