a+b/ab=( )/a^2b -2x/1-2x=(  )/2x^2-x 2a^2+2ab/3ab+3b^2=2a/( )

问题描述:

a+b/ab=( )/a^2b -2x/1-2x=(  )/2x^2-x 2a^2+2ab/3ab+3b^2=2a/( )
1.a+b/ab=( )/a^2b 2.-2x/1-2x=(  )/2x^2-x 3.2a^2+2ab/3ab+3b^2=2a/( )

1.a+b/ab=( a²+ab)/a^2b
2.-2x/1-2x=(2x²)/2x^2-x
3.2a^2+2ab/3ab+3b^2=2a(a+b)/3b(a+b)=2a/( 3b)