化简|x-1|-|3x-6|

当x2丨x-1丨-丨3x-6丨=(x-1)-(3x-6)=x-1-3x+6=5-2x

(x+1-1/1-x)÷(x-x²/x-1)=[(x+1)+1/(x-1)]×[-(x-1)/x(x-1)]=(x²-1+1)/(x-1)×(-1/x)=-x/(x-1)(x-4/

|x-1|+|x-10|表示数轴上x到1的距离+x到10的距离.显然最小值是9,此时x只要在1到10之间就好.类似的,|x-2|+|x-9|的最小值是7,此时x在2到9之间就好.|x-3|+|x-8|

是9x-x³原式=(x²+3x+9)/(x-3)(x²+3x+9)-6x/x(x-3)(x+3)-(x-1)/2(x+3)=1/(x-3)-6/(x-3)(x+3)-(x

（-2x^2+3x+2)-3(7x^2-5x-1)-(4x^2-x+6)=-2x^2+3x+2-21x^2+15x+3-4x^2+x-6=-2x^2-21x^2-4x^2+3x+15x+x+2+3-6

[(X+3)/(X^2-4)-(-X)/(6-X-X^2)]/[1-(X^2-3X-15)/(X^2+X-6)]={(x+3)/[(x+2)(x-2)]-x/[(x+2)(x-3)]}/[(4x+9)

零点是-1和2所以x2,原式=x+1-3x+6=-2x+7

原式=(x+2)/x(x+1)+(2x+1)/(x+1)(x+2)-(x-3)/x(x+2)=[(x+2)^2+x(2x+1)-(x+1)(x-3)]/x(x+1)(x+2)=(x^2+4x+4+2x

3x*x=1+x得6x*x*x+7x*x-5x+2000=3x^2*2x+7x^2-5x+2000=(1+x)2x+7x^2-5x+2000=9x^2-3x+2000=3(3x^2-x)+2000=3

中间错了原式=(x+2)/(x-3)(x+2)+2x/x(x-3)-(x+1)/(x-3)²=1/(x-3)+2/(x-3)-(x+1)/(x-3)²=3/(x-3)-(x+1)/

方程两边同时进行通分可得[5(x2-16)+96]/(x2-16)=[(2x-1)(x-4)+(3x-1)(x+4)]/(x2-16)再问：不好意思这是两道题再答：这好似第一个原式=(x+y)[(x-

x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)x/(x-2)=2x/(x-3)+(1-x)/(x-2)(x-3)x(x-3)/(x-2)(x-3)=2x(x-2)/(x-2)(x-3)

原式=(x+2)/(x+2)(x-3)-2x/x(x-3)-(x+1)/(x-3)²=1/(x-3)-2/(x-3)-(x+1)/(x-3)²=-1/(x-3)-(x+1)/(x-

(1)x＜-1|x+1|+|x-1|-|3x-6|=-x-1-x+1+3x-6=x-5(2)-1＜x＜1|x+1|+|x-1|-|3x-6|=x+1-x+1+3x-6=3x-4(3)1＜x＜2|x+1

（x+1）（x+2）（x+3）（x+6）-3x²=（x+1）（x+6）（x+2）（x+3）-3x²=（x²+7x+6）（x²+5x+6）-3x²=（x

利用因式分解,原式化简得,(x-3)/(x-2)-1原式=（√3-3）/（√3-2)-1=-3-√3-1=-√3-4

分步写,好让看的清楚符号[√(x^2-6x+9)/x^2-x-12]=√(x-3)^2/(x-4)(x+3）=（x-3)/(x-4)(x+3）；(x^3-16x)/(x^2-3x)=x(x^2-16)

（X²+3X+9/X²-27)+(6X/9X-X²)-(X-1/6+2X)=X²+3X+9/X²-27+6/9-X²-X+1/6+2X=9/

(2x-5)(3x+2)-6(x+1)(x-2)=6x²+4x-15x-10-6(x²+x-2x-2)=6x²-11x-10-6(x²-x-2)=6x²

原式=(x²+3x+9)/(x-3)(x²+3x+9)-6/(x+3)(x-3)-(x-1)/2(x+3)=1/(x-3)-6/(x+3)(x-3)-(x-1)/2(x+3)=(2