朋友,好象题少了些括号哦.是不是这样的:
1.(X^2+Y^2)/(X-Y)*[(Y-X)/(2XY)]=(X^2+Y^2)/(2XY)
2.(2x+6)/(4-4x+x平方)/(x+3)=2(x+3)/(4-4x+x平方)*[1/(x+3)]=1/(X-2)^2
朋友,好象题少了些括号哦.是不是这样的:
1.(X^2+Y^2)/(X-Y)*[(Y-X)/(2XY)]=(X^2+Y^2)/(2XY)
2.(2x+6)/(4-4x+x平方)/(x+3)=2(x+3)/(4-4x+x平方)*[1/(x+3)]=1/(X-2)^2