Question

分式的基本性质题（1） 2/m+3=( )/m^2+2m-3(2) 2a^2+2ab/3ab+3b^2=2a/( )(3

Answer 1

（1） 2/m+3=2(m-1)/(m+3)(m-1)=( 2m-2 )/m^2+2m-3

(2) ( 2a^2+2ab)/(3ab+3b^2)=2a(a+b)/3b(a+b)=2a/3b

(3) ( a^2+ab-2b^2)/(a^2-b^2)=(a+2b)(a-b)/(a+b)(a-b)=(a+2b)/(a+b)

(4) ( x-y)/2a=(x-y)*(x-y)/(x-y )*2a=(y-x)^2/[2a*(x-y)]