(2-3x)(x+4)=(3x-2)(1-5x) 5x^2-4x+1=0 (x+4)^2-(x+5)^2+(x-3)^2
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(2-3x)(x+4)=(3x-2)(1-5x) 5x^2-4x+1=0 (x+4)^2-(x+5)^2+(x-3)^2=24+4x
(2-3x)(x+4)=(3x-2)(1-5x)
5x^2-4x+1=0
(x+4)^2-(x+5)^2+(x-3)^2=24+4x
(2-3x)(x+4)=(3x-2)(1-5x)
5x^2-4x+1=0
(x+4)^2-(x+5)^2+(x-3)^2=24+4x
1:两边同时除以(2-3x):x+4=5x-1
移向:4x=5
x=5/4
2:除以5:x^2-4/5x+1/5=0
x^2-4/5x+4/25=-1/25
(x-2/5)^2=-1/25
无解
3:x^2+8x+16-(x^2+10x+25)+x^2-6x+9-4x-24=0
x^2-16x-24=0
(x-8)^2=40
x=2根号10加减8
移向:4x=5
x=5/4
2:除以5:x^2-4/5x+1/5=0
x^2-4/5x+4/25=-1/25
(x-2/5)^2=-1/25
无解
3:x^2+8x+16-(x^2+10x+25)+x^2-6x+9-4x-24=0
x^2-16x-24=0
(x-8)^2=40
x=2根号10加减8
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
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
|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|
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
1x+2x+3x+4x+5x+6x+7x…+99x=100
(X+2)/(X+1)-(X+4)/(X+3)=(X+6)/(X+5)-(X+8)/(X+7)
解方程:2x+4x+6x...+100x=1-(x+3x+5x+...+99x)
解方程 x+2/x+1+x+8/x+7=x+6/x+5+x+4/x+3