(3)(4x-2y)-[5x-(8y-2x-y)]+x (4)-(2x²-3x-1)-2(x²-3x
(3)(4x-2y)-[5x-(8y-2x-y)]+x (4)-(2x²-3x-1)-2(x²-3x
(3x-y)²-2x(4x-5y)-(x+2y)²
(x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3)
x/x-y*y^2/x+y-x^3y2/x^4-y^4/x^2/x^2+y^2
计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2)
x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
(x+3y-4)(2x-y)
(x+y)和(x-y)各看成一个整体,合并同类项2(x+y)-3(x-y)²+3(x+y)+4(x-y)
计算(2x-3y)²-(4y-3x)(4y+3x) (x+3)²-2(x+5)(x+1)+(x-2)