a/xy .b/yz c/a-b .1/(b-a)^21/2a .1/5a^2bb/a(b+1) a/b(b+1)2a/2a+1 4(2a-1)/4a^2-4a+1a-1/(a+1)^2-4 1-a/2-4a+2a^2
问题描述：
a/xy .b/yz
c/a-b .1/(b-a)^2
1/2a .1/5a^2b
b/a(b+1) a/b(b+1)
2a/2a+1 4(2a-1)/4a^2-4a+1
a-1/(a+1)^2-4 1-a/2-4a+2a^2
答
a/xy .b/yz =ab/zxy^2
c/a-b .1/(b-a)^2=-c/(b-a)^3
1/2a .1/5a^2b=1/10a^3b
b/a(b+1) a/b(b+1)=1/(b+1)^2
2a/2a+1 4(2a-1)/4a^2-4a+1=题错