(x+2)(x+5)=x²+7x+10.(x-2)(x-5)=x²-7x=10……总结规律
解方程.(5x/x²+x-6)+(2x-5/x²-x-12)=7x-10/x²-6x+8
(x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2
1x+2x+3x+4x+5x+6x+7x…+99x=100
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
解方程x²+x-6分之5x+x²-x-12分之2x-5=x²-6x+8分之7x-10
2x+3x+4x+5x+x+6x+7x=100
(x/x-1)+(5x-2)/x*x-x=1 求x(有图)
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!)+.
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
设函数f(x)=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10),
求和:Sn=1+3x+5x*x+7x*x*x+……+(2n-1)x^n-1 (x不为0和1)