通分:(2-x)^2分之1與x^2-4分之x

通分:(2-x)^2分之1與x^2-4分之x


1/(2-x)^2=1/(x-2)^2=(x+2)/[(x+2)(x-2)^2]
x/(x^2-4)=x/[(x+2)(x-2)]=x(x-2)/[(x+2)(x-2)^2]



通分2(x+1)分之x,x^2-x分之1


x^2-x=1/(x-1)-1/x
1/2(x+1)=0.2(1-1/(x+1))