(5X-1200)×13/10=4X-1000
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
(5X-1200)×13/10=4X-1000
(5x-1200)/(4x-1000)=13/10
(5x-1200)/(4x-1000)=13比10
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),
x-4/x-6+x-8/x-10=x-5/x-7+x-7/x-9
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
二元一次方程组:3x+5x=13 4x+3x=10
二元一次方程组:3x+5x=13,4x+3x=10
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x