(x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3)
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(x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3)
解方程组:(x+10)(x-8)=x的平方-100
解方程组:(x+10)(x-8)=x的平方-100
(x+2)(x+3)=x²+5x+6
(x-4)(x+1)=x²-3x-4
(y+4)(y-2)=y²+2y-8
(y-5)(y-3)=y²-8y+15
x²+2x-80=x²-100
2x=-20
x=-10
(x-4)(x+1)=x²-3x-4
(y+4)(y-2)=y²+2y-8
(y-5)(y-3)=y²-8y+15
x²+2x-80=x²-100
2x=-20
x=-10
(x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3)
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
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)
x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
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x/x-y*y^2/x+y-x^3y2/x^4-y^4/x^2/x^2+y^2
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(2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y)
1) (2x+5y)(2x-5y)(-4x^2-25y^2) 2) [(x+y)(x-y)-(x-y)^2+2y(x-y