X÷12+2=X÷9+0.5

A={x|x^2-2x-3<3(1-x)}={x|x^2+x-6<0}={x|-3<x<2}B={x|9-x^2>6-2x}={x|x^2-2x-3<0}={x|-

1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550120x=550x=55/12=4.583

2x-6/x^2-4x+4÷4x-12/x^2-4÷(x+2)=2x-4x-6/x^2-12/x^2+4÷4x-4÷(x+2)=-2x-1/4x+1/x-1/(x+2)将x=1/2带入,原式得=-2*

x=1/x所以x=±1原式=(x+2)÷[(x+3)(x-3)/(x+3)]=(x+2)/(x-3)所以x=-1,原式=(-1+2)/(-1-3)=-1/4x=1,原式=(1+2)/(1-3)=-3/

x²+2x／x²-6x+9÷x²-4／x²-3x=x(x+2)/(x-3)^2*x（x-3）/（x+2)(x-2)=x^2/[(x-3)(x-2)]

x^2=x*xx^3=x*x*xx^4=x*x*x*x...[2x÷（x-3）-x÷(x+3）]*(x^2-9)÷x=[2÷（x-3）-1÷(x+3）]*(x^2-9)=(2(x+3)-(x-3))/

13-2x=4-2x=4-13-2x=-9x=4.53x+4*0.5=9.83x=9.8-23x=7.8x=2.65(x+4)=55x+4=11x=11-4x=79/(1.5x)=89=8*1.5x1

(0.5+x)+x=9.8÷22x+0.5=4.92x=4.9-0.52x=4.4x=2.2

(2x-6)/(x²-4x+4)÷(3-x)/(x²+6x+9)×(2-x)/(x+3)=2（x-3)/(x-2)^2X(x+3)^2/(3-x)X(2-x)/(x+3)=2（x-

原式=2x(x-2)/(x+2)×x(x+2)/(x-2)²×3(x-2)/x=6x当x=√3/2时原式=3√3

先一个一个的展开括号项,再同项合并就行了啊[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x=[xx-xy-(xy-yy)+x(x-y)+y(x-y)]÷2x=[xx-xy-xy+yy+xx-

1.(x^3-3x^2)/(x^2+5x+6)÷(x^3-9x)/(x^2+2x-3)*(x+2)/(2x)=x^2(x-3)/(x+2)(x+3)*(x+3)(x-1)/x(x+3)(x-3)*(x

解1：原式=x(x-1)/(x+1)*(x+1)/x=x-1解2：原式=(x+3)^2/(x+3)(x-3)*(x-3)/(x+2)=(x+3)/(x-3)*(x-3)/(x+2)=(x+3)/(x+

原式化简：{（x-3)(x-2)/(x-3)(x-4)}²÷{(x+1)(x+2)/(x-4)(x+2)}²{(x-2)/(x-4)}²÷{(x+1)/(x-4)}

A与代数式x-a之间有何关系?A能被x-a整除x+3能整除x^2+kx-18x=-3代入得9-3k-18=0k=-3再问：x为什么等于-3呃再答：x+3能整除x^2+kx-18也就是x+3=0时x^2

题目都写不清楚.x=0

设这个数为X则：5X+0.5=505X=49.5X=9.9再答：3.32.8/(7+1)=4.14.设这个数是X45%X+3.6=12.6X=205.圆的周长为2πr=2*3.14*2=12.56则正

1.两边乘X(X-2)X=3(X-2)X=3X-6X=3分式方程要检验经检验,X=3是方程的解2.原式=[-(X-3)²/(X+3)(X-3)]÷[2(X-3)/X(X+3)]=[-(X-3

分式计算：[(x²+2x)／(x²-6x+9)]÷[(x²-4)／(x²-3x)]原式=[x(x+2)/(x-3)²]•[x(x-3)/(

=(x-2)/(x+3)(x-3)×(x²+2x-3)/(x-2)²×(x+3)/(x+1)=(x-2)/(x+3)(x-3)×(x-3)(x+1)/(x-2)²×(x+