x-y/2x+2y与xy/(x+y)^2 初二通分题 两道 100财富x-y/2x+2y与xy/(x+y)^2 2mn/4m^2-9与2m-3/2m+3

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x-y/2x+2y与xy/(x+y)^2初二通分题两道100财富x-y/2x+2y与xy/(x+y)^22mn/4m^2-9与2m-3/2m+3x-y/2x+2y与xy/(x+y)^2初二通分题两道1

x-y/2x+2y与xy/(x+y)^2 初二通分题 两道 100财富x-y/2x+2y与xy/(x+y)^2 2mn/4m^2-9与2m-3/2m+3
x-y/2x+2y与xy/(x+y)^2 初二通分题 两道 100财富
x-y/2x+2y与xy/(x+y)^2 2mn/4m^2-9与2m-3/2m+3

x-y/2x+2y与xy/(x+y)^2 初二通分题 两道 100财富x-y/2x+2y与xy/(x+y)^2 2mn/4m^2-9与2m-3/2m+3
x-y/2x+2y与xy/(x+y)^2
2x+2y与(x+y)^2的最小公倍数是2(x+y)^2
x-y/2x+2y=x-y/2(x+y)=(x-y)(x+y)/2(x+y)^2=x^2-y^2/2(x+y)^2
xy/(x+y)^2=2xy/2(x+y)^2
2.2mn/4m^2-9与2m-3/2m+3
4m^2-9=(2m)^2-3^2=（2m+3）(2m-3)与2m+3的最小公倍数是4m^2-9
2mn/4m^2-9
2m-3/2m+3=(2m-3)^2/（2m+3）(2m-3)=(2m-3)^2/4m^2-9

（x-y)(x+y)/2(x+y)² 2xy/2(x+y)²
2mn/ (2m+3)(2m-3) 4m^2-9/(2m+3)(2m-3)

与是什么意思相加还是相减

2xy/(x+y)(x+y)与x/(x+y)(x-y)怎么通分 2xy/(x+y)^与x/x^-y^ (-x-y)(x^2+xy+y^2) 化简x^-y^/x^-2xy+y^ 2*(x-y)²(y-x)(xy) X-Y/2X+2Y XY/X+Y² 因式分解：x×x-xy-2y×y-x-y （x^2+xy/x-y)/（xy/x-y)计算 (x+y)/x /(x-(2xy-y^2)/x) 因式分解 因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) (x-y)[(x+y)^2-xy]+(x-y)[(x-y)^2+xy] x³-xy²/x³+2x²y+xy² 与x²-y²/x(x+3y)+y(y-x) 急、、、、 x根号x+x根号y/xy-y^2)-（x+根号xy+y/x根号x-y根号）y 代数 x^-y^/ x^-(y-z)^ 除以 x^+2xy+y^/(x-y)^-z^ 乘 x^+xy-xz/x^-xy 设x,y∈R,比较(x*2+y*2)*2与xy(x+y)*2 计算:2xy/(x+y)².(x+y)/4y 通分x-y/2x+2y与xy/(x+y）的2次方 通分x-y/2x+2y与xy/(x+y)2