1.x-y/(2x+2y)与xy/(x+y)^22.2mn/(4(m^2)-9)与2m-3/(2m+3)

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1.x-y/(2x+2y)与xy/(x+y)^22.2mn/(4(m^2)-9)与2m-3/(2m+3)

1.x-y/(2x+2y)与xy/(x+y)^22.2mn/(4(m^2)-9)与2m-3/(2m+3)
1.x-y/(2x+2y)与xy/(x+y)^2
2.2mn/(4(m^2)-9)与2m-3/(2m+3)

1.x-y/(2x+2y)与xy/(x+y)^22.2mn/(4(m^2)-9)与2m-3/(2m+3)
1.( x-y)/(2x+2y)与xy/(x+y)^2
分母是2(x+y)和(x+y)^2
所以最简公分母是2(x+y)^2
所以
( x-y)/(2x+2y)=(x+y)(x-y)/2(x+y)^2
xy/(x+y)^2=2xy/2(x+y)^2
2.2mn/(4m^2-9)与2m-3/(2m+3)
分母是(2m+3)(2m-3)和2m+3
所以最简公分母是(2m+3)(2m-3)
所以
2mn/(4m^2-9)=2mn/(4m^2-9)
2m-3/(2m+3)=(2m-3)^2/(4m^2-9)

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