化解分式a-9b/6ab²-a+3b/9a²-b要通分，再计算要有过程1；a-9b/6ab²-a+3b/9a²-b2；2xy/x²y²+x/x+y-y/y-x3;a-1/a²+3a+2-6/a²-a-24;1/x²+13x+42+1/x²-14X+48+1/x²-15x+56答得好有分哦

Question

化解分式a-9b/6ab²-a+3b/9a²-b
要通分，再计算要有过程1；a-9b/6ab²-a+3b/9a²-b 2 ；2xy/x²y²+x/x+y-y/y-x 3;a-1/a²+3a+2-6/a²-a-2 4;1/x²+13x+42+1/x²-14X+48+1/x²-15x+56答得好有分哦

Answer 1

3a^2-ab)/(9a^2-6ab+b^2)
=(3*9/4+17/12)/(9*9/4-4/3)
=(27/4+17/12)/(81/4-4/3)
=(81/12+17/12)/(243/12-16/12)
=(98/12)/(227/12)