y=-x^2+2x+3=-(x^2-2x+1)+4=-(x-1)^2+4

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 x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 求函数y=\x-1\+\x-2\+\x-3\+\x-4\+\x-5\+\x-6\+.+\x-10\的最小值 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 函数,y=3x/(x^2+x+1) ,x 函数y=3x/(x^2+x+1) （x 分解因式计算:x^2(x-y)+(y-x)=?x^3+x^2+1\4x=?(2x+y)^2-(x-2y)^2=? y=(x^2+x)/(x+1) y=2x+1\x-3(x>4)值域 y=(x-1)(x-2)(x-3)(x-4)...(x-n) 已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(