(-y+5+4y^2)-(-y^2+5y-4),其中y=-2
(-y+5+4y^2)-(-y^2+5y-4),其中y=-2
先化简,在求值:6y-(y+2分之y + 2-y分之y)除以y³-4y-2y²+8分之y,其中y=
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
.先化简再求值:(2x+y)(2x+y)-(2x-y)平方其中X,Y满足X平方+Y平方-2X+4Y+5=0
(2y-3)(-y+4)=(y-2)(y-5)-3y(y-7/3)解方程
[(x+2y)²-(x+y)(3x-y)-5y²]÷(2x),其中x,y满足x²+4x+y
先化简再求值:(2x+y)(2x-y)-(-2x+y)^2,其中x^2-4x+y^2+2y+5=0.
(3x+2y)(4x-5y)-11(x+y)(x-y)+5xy,其中x=2分之七,y=-2分之5
[(x+2y)(x-2y)-(x+4y)2]÷4y,其中x=5,y=2.
化简求值{(x=2y)(5x-2y)-(3x+2y)(3x-2y)]/4x,其中x=2,y=-1
先化简,再求值:[(5X+2Y)(3X+2Y)+(X-2Y)(X+2Y)]/4X,其中X=2,Y=-3
初二化简求值题[(5x+2y)(3x+2y)+(x+2y)(x-2y)]/4x,其中x=2,y=3