Question

1:(a-1)x=b (a≠1); 2:(a-1)x=b; 3:ax-b=bx-a; 4:a分之x-1-b分之1-x=a

Answer 1

1:(a-1)x=b (a≠1)

x=b/(a-1)

2:(a-1)x=b;

a=1,b=0,x有无数解

a=1,b≠0,无解

a≠1,x=b/(a-1)

3:ax-b=bx-a;

ax-bx=b-a

(a-b)x=-(a-b)

a=b,有无数解

a≠b,x=-1

4:a分之x-1-b分之1-x=ab分之a+b(a+b≠0)

两边乘ab

bx-b-a+ax=a+b

(a+b)x=2(a+b)

x=2