化简(x+y)+(2x+y/1*2)+(3x+y/2*3)+.+(9x+y/8*9)
化简:(x+y)+(2x+y/1*2)+(3x+y/2*3)+...+(9x+y/8*9)
化简(x+y)+(2x+y/1*2)+(3x+y/2*3)+.+(9x+y/8*9)
9y=3x-(x-1),4(x+y)-(2x+4)=8y
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方
化简(x+y)+(2x+1/2y)+(3x+2/3y)+(4x+3/4y)+...+(9x+8/9y)=?
3x-2y=9 x-3y=2 x+y=5 x+2y=3 y=x 2x+y=8
先化简再求值:(x-2y)²-(x+2y)(x-2y)-(x-3y)(x-y).其中x²+9y
9xy(x-y)(x+1)-3y(x-y)(3x+2y)+6y的平方(x-y)(x+1),因式分解
1、x(x-y)(x+y)-x(x+y)^2
【x-3y][x+y]-[x-2y][x +2y]-[x-y
[(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y)