计算:(6x^5-7x^4y+x^3y^2+20x^2y^3-22xy^4+8y^5)/(2x^2-3xy+y^2)

计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2) 3x+2=y 5X+4=Y 7X+6=Y 9X+8=y 11x=y要如何计算 计算：(x-y)^7÷(y-x)^6+(-x-y)^3÷(x+y)^2 计算(x-y)^7÷(y-x)^6+9-x-y)^3÷(x+y)^2 计算3x-2y-(9x-7y)+2(4x-5y) 计算 3x+4y/x-y+3y/y-x-4x/x-y 计算 3(2x-7y)(7y+2x)+(4x+5y)(-5y-4x) 计算:(x+y)^2×(-x-y)^3×[-3/4(x-y)^3]×5/6(y-x)^2 计算:(x+y)^2×(-x-y)^3×[-3/4(x-y)^3]×5/6(y-x)^2 计算：6x²y+2xy-3x²y²-7x-5yx-4y²x²-6x²y 计算3x/(x-3y)+(x+y)/(4y-x)-7y/(x-4y)=? (3x-4y)(5x-4y)-(7x-8y)(6y-5x) 计算：（3x-4y）-[-（2y+x）+（x-3y）]-6x 计算(x+y)(x-y)(x+y)3次方(x-y)5次方计算(x+y)×(x-y)×(x+y)3次方×(x-y)5次方 计算.化简4x²+2x+7+3x-8x²-26x²y+2xy-8x²y-4x-5xy+2y²x²-6x²y 计算:1/(x-y)-1/(x+y)-2y/(x^2+y^2)-4y^3/(x^4+y^4)-8x^7/(x^8+y^8) 先化简,后求值（x+5y)(x+4y)(x-y)(x+y),其中,x=-2又2/3,y=3/7,用公式计算 计算：x(x-3y)(5x-2y)