数学题6y^2 - 9y +5 - y^2+4y - 5y^2
数学题……555{(3x+y)(3x-y)-(x-5y)(5x-y)-(x-2y)²÷(-4x),x=-2.y
(-y+5+4y^2)-(-y^2+5y-4),其中y=-2
解3y+5/3y-6=1/2+5y-4/2y-4
4x-2y-6y*-y-3x+5y* *=2 就是平方
解方程:(y+4)/5+y+6=(y+8)/2-(y+4)/3
4x-2y-6y平方-y-3x+5y平方
x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
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=
(2y-3)(-y+4)=(y-2)(y-5)-3y(y-7/3)解方程
解方程 2y+5/3y-6-y/2=5y-4/2y-4
解方程:2y+5/3y-6 — y/2 = 5y-4/2y-4
1) (2x+5y)(2x-5y)(-4x^2-25y^2) 2) [(x+y)(x-y)-(x-y)^2+2y(x-y