-x的平方 9x-20分之x的平方-7x 12
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原式=(x-3)^2)*[(x+3)/(x-3)(x-6)]=(x+3)(x-3)/(x-6)=(x^2-9)/(x-6)
x的平方-9分之x的平方-4x+4除以x的平方+3x分之x的平方-4除以x的平方=(x-2)²/(x+3)(x-3)÷(x+2)(x-2)/x(x+3)÷x²=(x-2)(x+2)
x/(x²-3x)×(x²-9)=x/x(x-3)×(x-3)(x+3)=x+3
题意是这样的吧:求(x²+9x)/(x²+3x)+(x²-9)/(x²+6x+9)原式=(x²+9x)/(x²+3x)+(x+3)(x-3)
再答:所以,方程有四个根x=-5x=-2x=-1x=2再答:二十年教学经验,专业值得信赖!如果你认可我的回答,敬请及时采纳,在右上角点击“评价”,然后就可以选择“满意,问题已经完美解决”了。
X的平方+3X分之X的平方+9X+X的平方+6X+9分之X的平方-9=x(x+3)分之(x²+9x)+(x+3)²分之(x+3)(x-3)==x(x+3)分之(x²+9x
=(x+2)(x-1)/(x-3)×(x-3)²/(x+2)=(x-1)(x-3)=x²-4x+3
=2(x-3)/(x+3)(x-3)+(x+1)²/(x+3)(x-2)×(x-2)/(x+1)=2/(x+3)+(x+1)/(x+3)=(x+3)/(x+3)=1
[(x的平方-3x)分之(x+3)-(x的平方-6x+9)分之(x-1)]÷x分之(x-9)=[(x+3)/(x^2-3x)-(x-1)/(x^2-6x+9)])]÷[(x-9)/x]=[(x+3)/
1:2分之3X的平方-{-2分之1X平方}+{-2X平方}=3x²/2+x²/2-2x²=4x²/2-2x²=2x²-2x²=02
原式=(x-3)/(x²+x)*1/(x-3)²约去x-3=1/[(x-3)(x²+x)]=1/(x³-2x²-3x)
原式=(x+6)(x-3)/[x(x+6)]*1/(x-3)²=1/[x(x-3)]=1/(x²-3x)
9开根号3
(x²+6x+9)分之(x-3)+(9-x²)分之x=(x²+6x+9)分之(x-3)-(x²-9)分之x=(x+3)²分之(x-3)-[(x+3)(
x^2+3x-x^2-20/3x=83x-20/3x=8两边都乘以3x,则9x^2-20=24x9x^2-24x-20=0(3x-10)(3x+2)=0x=10/3,-2/3
原式=x(x-9)/x(x+3)-(x+3)(x-3)/(x-3)²=(x-9)/(x+3)-(x+3)/(x-3)=(x²-12x+27-x²-6x-9)/(x+3)(
(x²-6x+9)/(x+1)÷(x²-9)/(x²+x)=[(x-3)²/(x+1)]×[x(x+1)/(x+3)(x-3)]=x(x-3)/(x+3)x的平
(x-5分之x-5-x分之x)\x的平方-25分之2x=2x/(x-5)*(x-5)(x+5)/2x=x+5
原式=1/(x+1)*[(x-3)/(x+3)^2+2/(x+3)]-x/(x+3)(x-3)=1/(x+1)[3(x+1)/(x+3)^2]-x/(x+3)(x-3)=3/(x+3)^2-x/(x+
x+x分之1=3所以x0X^2-3X+1=0X=(=(3+根号下5)/2或=(3-根号下5)/2x的平方+9x-3分之x的平方=2/3X^2+9x把X^2=1-3x代入得2/3-2X+9x=2/3+7