Question

初二数学分式通分

（1）x/3y与3x/2y² (2)x-y/2x+2y与xy/(x+y)²
∵公分母为 ∵公分母为
∴x/3y= ∴x-y/2x+2y=
3x/2y²= xy/（x+y）²=

（3）2mn/4m²-9与2m-3/2m+3
∵公分母为
∴2mn/4m²-9=
2m-3/2m+3=
就按以上格式、解答

Answer 1

（1）x/3y与3x/2y² (2)x-y/2x+2y与xy/(x+y)²
∵公分母为 6y² ∵公分母为2(x+y)²
∴x/3y= 2xy/6y² ∴x-y/2x+2y=(x-y)(x+y)/2(x+y)²
3x/2y²= 9/6y² xy/（x+y）²=2xy/2(x+y)²

（3）2mn/4m²-9与2m-3/2m+3
∵公分母为4m²-9
∴2mn/4m²-9=2mn/4m²-9
2m-3/2m+3=(2m-3)²/4m²-9

Answer 2

找老师