10^2x=25,则10^-x=
解方程:(2x+5)(4x*x-10x+25)=8x(x*x+1)
(x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2
解方程(x/x(x+2))+(x/(x+2)(x+4))+.+x/(x+8)(x+10)=1
已知x>0,则函数f(x)=(2x^2+7x+10)/x
x+2x×10=10x+2x+36
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),
已知函数f(x){x+1,x≤0 -2x,x>0,若f(x)=10则
(x+5)²-(x-2)(x-3) =x²+10x+25-(x²-5x+6) *5x怎么来
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
1x()+2x()+3x()+4x()+5x()+6x()+7x()+8x()加9x()+10x()=1980
1X?+2X?+3X?+4X?+5X?+6X?+7X?+8X?+9X?+10X?=1980求?是多少