-5(x-2y+1)-(1-3x+4y)化简,
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
(x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3)
化简,并求值2(x-2y)²-4(x+3y)(x-3y)-2(x-y).(y+x)-5(-x-1)²
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
1) (2x+5y)(2x-5y)(-4x^2-25y^2) 2) [(x+y)(x-y)-(x-y)^2+2y(x-y
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
化简:根号(4y^5)-(4xy^4)+(x^2y^3)(y>1/2x)
3x-2y=1 4x-5y
求解;一 (x-8y)(x-y) 二 (Y+2)(Y-2)-(Y-1)(Y+5) 三 (3X+4)(3X-4)-(2X+
化简1) (-2x^ y^)(3x^ y^)(-4x^ y^)2) (6√x)\(3√x√x^5)3)已知函数f(x)的
[(x+2y)(x-2y)-(2x-y)^+(3x-y)(2x-5y)]除(-2分之1乘x) 化简