[10x+(8-x)][(8-x)*10+x]=1855
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[10x+(8-x)][(8-x)*10+x]=1855
![[10x+(8-x)][(8-x)*10+x]=1855](/uploads/image/z/1847881-1-1.jpg?t=%5B10x%2B%288-x%29%5D%5B%288-x%29%2A10%2Bx%5D%3D1855)
(9X+8)(-9X+80)=1855
-81X^2+648X+640-1855=0
X^2-8X+15=0
X=3或5
-81X^2+648X+640-1855=0
X^2-8X+15=0
X=3或5
[10x+(8-x)][(8-x)*10+x]=1855
(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
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+7/x+6)+ (x+9/+x+8)=(x+10/x+9)+(x+6/x+5)
1.x+9/x+8- x+10/x+9=x+6/x+5- x+7/x+6;
⒈ 解方程 (X+7)/(X+6)+(X+9)/(X+8)=(X+10)/(X+9)+(X+6)/(X+5)
x-4/x-6+x-8/x-10=x-5/x-7+x-7/x-9
|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|
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