X²-5X+3
(x+3)² -x(x-5) 其中X=-½
4x²-{-3x²-[5x-x²-(2x²-x)]+4x},其中x=½
帮x²-x-6/x-/x-3/x²-5x+6
x(x²-1)+2x²(x+1)-3x(2x-5)计算
(x-2)(x-3)+2(x+6)(x-5)-3(x²-7x+13)化简
用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+.
5x²+[x²+(5x²-2x)]-2(x²-3x),其中x=-1
计算[(x²-5x+6)/(x²-4x+3)]+[(x²-4x+3)/(x²-2
((x²-5x+6)/(12-7x+x²))²÷((x²+3x+2)/(x
计算:[(-5+x)(-x-5)]² (x+3)²-(x+2)(x-1) (3x-a)(3x+a)(
已知(x-2)(x²-6x-9)=x(x-5)(x-3),求6x的算术平方根
3-2x²+3x+3x²-5x-2x²-7