Question

1,x-a分之a + b=1(b不等于1)

Answer 1

1.

a/(x-a)+b=1

x-a=a/(1-b)

x=a+a/(1-b)

2.

m/x-n/(x+1)=0

x/m-(x+1)/n=0

x(1/m-1/n)=1/n

x=(1/n)/(1/m-1/n)=m/(n-m)