7-9x/2-3x -4x-5/2-3x =1 x=?
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7-9x/2-3x -4x-5/2-3x =1 x=?
(7-9x)/(2-3x) -(4x-5)/(2-3x) =1
[(7-9x) -(4x-5)]/(2-3x) =1
(7-9x -4x+5)/(2-3x) =1
(12-13x)/(2-3x) =1
(12-13x)/(2-3x) -1=0
[(12-13x)-(2-3x) ]/(2-3x) =0
(12-13x-2+3x)/(2-3x) =0
(10-10x)/(2-3x) =0
10(1-x)/(2-3x) =0
(1-x)/(2-3x) =0
1-x=0
x=1
经检验x=1是方程的解
[(7-9x) -(4x-5)]/(2-3x) =1
(7-9x -4x+5)/(2-3x) =1
(12-13x)/(2-3x) =1
(12-13x)/(2-3x) -1=0
[(12-13x)-(2-3x) ]/(2-3x) =0
(12-13x-2+3x)/(2-3x) =0
(10-10x)/(2-3x) =0
10(1-x)/(2-3x) =0
(1-x)/(2-3x) =0
1-x=0
x=1
经检验x=1是方程的解
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
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
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
|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
1X?+2X?+3X?+4X?+5X?+6X?+7X?+8X?+9X?+10X?=1980求?是多少
已知1+x+x^2+x^3=0,求x+x^2+x^3+x^4+x^5+x^6+x^7+x^8的值
解方程:(x+3)/(x+2)-(x+5)/(x+4)=(x+7)/(x+6)-(x+9)/(x+8)
1x+2x+3x+4x+5x+6x+7x…+99x=100