计算:[5X+7Y-3][5X+3-7Y]
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)
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
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)(x-y)(x+y)3次方(x-y)5次方
计算 (3X-5Y)+(-3X+Y) 7X-「-2X-(8X-1)」
(3x-4y)(5x-4y)-(7x-8y)(6y-5x)
计算 3x-2y-5x+7y-1,其中x=-1/2,y=-1
x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
计算[(x-y)^3]^m[(x-y)^m]^5=.
计算:(3x-y)2-(2x+y)2+5x(y-x)
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