初二数学，分式的通分，步骤完整，急需，谢谢
\u521d\u4e8c\u6570\u5b66\u5206\u5f0f\u901a\u5206\uff081\uff09x/3y\u4e0e3x/2y² (2)x-y/2x+2y\u4e0exy/(x+y)²
\u2235\u516c\u5206\u6bcd\u4e3a 6y² \u2235\u516c\u5206\u6bcd\u4e3a2(x+y)²
\u2234x/3y= 2xy/6y² \u2234x-y/2x+2y=(x-y)(x+y)/2(x+y)²
3x/2y²= 9/6y² xy/\uff08x+y\uff09²=2xy/2(x+y)²
\uff083\uff092mn/4m²-9\u4e0e2m-3/2m+3
\u2235\u516c\u5206\u6bcd\u4e3a4m²-9
\u22342mn/4m²-9=2mn/4m²-9
2m-3/2m+3=(2m-3)²/4m²-9
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