4 xⁿy² ＋ x²y³ ⁿ＝5 怎么算?

4 xⁿy² ＋ x²y³ ⁿ＝5 怎么算? (x+y)²+4(x+y)-5 (y-x)(x-y)^3(y-x)^5怎么算 因式分解 -5x³y(x-y)³+20y【x²（y-x）】² 计算 [12(x+y)³(y-x)]³÷[4(x+y)²（x-y)]² 计算4（x+y）^5（x-y）^4÷[2（x+y）³*（y-x）²] [(3x+y)²-(3x-y)²]÷(4x-2y)计算 怎么做? 已知一个多项式加﹣2x³＋4x²y＋5y³得到X³－3X²Y＋2Y&# 已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y (x-y)³+9(x-y)-6(x-y)² (x-y)³(x-y)²(y-x)等于多少 已知x,y为实数,且2（x+2y）＝x²+y²+5求代数式3x-4y分之x²+y²