7x+5x+3(10-2x)=48 急
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),
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
(1+1/3)x=28 (1-2/7)x=40 x-2/5x=36 x+4/7x=55 急
解方程:5x+3(9-x)=41 5x+10(25-x)=170 2x+4(10-x)=32 急 要求,
|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|
1元2次方程,急,1 X^2-7X-1=02 2X^2+3X=33 X^2-2X+1=254 X(2X-5)=4X-10
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
3x的平方-(2x的平方+5x-1)-(3x+1),其中x=10 急
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