通分①x／3y与3x／2y²②x-y／2x+2y与(x-y)／(x+y)²③2mn／4m²

通分①x／3y与3x／2y²②x-y／2x+2y与(x-y)／(x+y)²③2mn／4m² 2xy/(x+y)(x+y)与x/(x+y)(x-y)怎么通分 2x+2y/x-y与（x²+y²）/xy通分 2x+2y/x-y与(x+y)²/xy 怎么通分 (x-y)/(2x+2y)与(xy)/（x+y）²通分要过程 通分:x-y/2x+2y与xy/(x+y)^2 ,2mn/4m^2-9与2m-3/2m+3 通分(x-y)÷(2x+2y)与xy÷(x+y)² 2mn÷4m²-9与(2m-3)(2m+3) 分式的通分与约分①：x/a(x-y),y/b(y-x)；②：1/x^2-1,2x/x^2-3x+2； x/xy-y²与y/x²-xy 通分 (2x-y)²-4(x-y)(x+2y) 化简：（2x-y)²-4(x-y)(x+y) 通分；2/3a与3/-4ab²；1/x-y与2/x²-y²；2/x²-9与x/6