10x(5x²-y)-2x(5y+25x²)-3xy 求化简

化简 (x+y)(x²-xy+y²) ； 3（2x-1）(x+6)-5(x-3)(x+6) 已知(x+3）+丨X-y+10丨=0 ,求5x²y-[2x²y-（3xy-xy²）-3x& 1/x+1/y=5,求2x-3xy+2y/x²+xy+y的值 化简（3X²-XY+Y²）-5(X²-XY+2Y²） x²/xy-x/y [-(x-y)^2/xy]^-4*(y^2-xy/x)^3*(x^4/y^10)÷(xy-y^2/x)^-5=-y(y- 已知：（x+2）²+|x+y-10|=0,求3x²y－[5x²y－﹙2xy－x² 因式分解x的5次方y-x³y+2x²y-xy -3(xy-2x²)-[y²-(5xy-4x²)+2xy] 已知x+y=3 xy=-5 求x设abc=1 求x²+3xy+2y²/x²y+2xy
急![(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy) 已知x²+y²-2x+4y+5=0,求X^4-y^4/2x^2+xy-y²·2x-y/xy