(1/2x^4y^2-1/3x^3y^3-3/4x^2y^4)÷(-2/3X^2Y^2)
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(1/2x^4y^2-1/3x^3y^3-3/4x^2y^4)÷(-2/3X^2Y^2)
(1/2x^4y^2-1/3x^3y^3-3/4x^2y^4)÷(-2/3x^2y^2)
=x^2y^2(1/2x^2-1/3xy-3/4xy^2)÷[x^2y^2(-2/3)]
=(1/2x^2-1/3xy-3/4xy^2)÷(-2/3)
=(1/2x^2-1/3xy-3/4xy^2)*(-3/2)
=-3/4x^2+1/2xy+9/8xy^2
=x^2y^2(1/2x^2-1/3xy-3/4xy^2)÷[x^2y^2(-2/3)]
=(1/2x^2-1/3xy-3/4xy^2)÷(-2/3)
=(1/2x^2-1/3xy-3/4xy^2)*(-3/2)
=-3/4x^2+1/2xy+9/8xy^2
(x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3)
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
(x+3y-4)(2x-y)
x/x-y*y^2/x+y-x^3y2/x^4-y^4/x^2/x^2+y^2
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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)+...-(
(2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y)
[(2x+y)^2+(y+2x)(y-2x)-2y(4x-y)]/4y,其中x=1/2,y=1/3
先化简,再求值:[(x+y)(x-y)-(x-y)^2+2y(x-3y)]/(-4y),其中x=1,y=-2
9y=3x-(x-1),4(x+y)-(2x+4)=8y
(2x-y)(2x+y)+(2x-y)(y-4x)+2y(y-3x)+2x^4y^2÷(xy)^2