先化简(x的平方-2x 1除以x的平方-1)-搜答案-智慧作业帮

(8x+9)/(x^2+x-6)=a/(x+3)+b/(x-2)8x+9=a(x-2)+b(x+3)8x+9=(a+b)x+(3b-2a)建立方程组a+b=83b-2a=9得到解a=3b=5

(x-1)²/(x²-1)+x²/(x+1)=[(x-1)²+x²(x-1)]/(x²-1)=(x²-2x+1+x³-x

x^2=x的平方‘/’为除以[(x+2y)^2-(x+y)(x-y)-5y^2]/(2x)=[(x^2+4xy+4y^2)-(x^2-y^2)-5y^2]/(2x)=[4xy]/(2x)=2y[(3x

((x+2)/(x^2-2x)-(x-1)/(x^2-4x+4))/((x^2-16)/(x^2+4x))=((x+2)(x-2)-(x-1)x)/((x-2)^2*x)/((x-4)/x)=((x-

由韦达定理得：X1+X2=-2,X1*X2=-3/2,X1^2+X2^2=(X1+X2)^2-2X1*X2=4+3=7(X2/X1)^2+(X1/X2)^2=［(X1^2+X2^2)^2-2(X1*X

1除以(x的平方+3x+2)+1除以(x平方+5x+6)+1除以(x平方+7x+12)=1/（x+1）（x+2）+1/(x+2)(x+3)+1/(x+3)(x+4)=1/(x+1)-1/(x+2)+1

x1+x2=4x1x2=1/2原式=(x1+x2)²÷(x1+x2)/x1x2=x1x2(x1+x2)=2

再问：我去再问：再问：是这个再问：是x分之2么再答：是的

4-4x+x^2分之2x-6除以（x+3)乘以3-x分之x^2+x-6=2(x-3)/(x-2)×1/(x+3)×(x+3)(x-2)/(3-x)=-2/(x-2)

是你的题,不明确的是这样木那这个x=多少呢

x的平方-6x+9除以2x的平方-18=(x-3)^2/2(x+3)(x-3)=(x-3)/2(x+3)=44/100=11/25

[（x-1)/x-(x-2)/(x+1)]÷[(2x^2-x)/(x^2+2x+1)]=[(x-1)(x+1)-x(x-2)]/x(x+1)÷[x(2x-1)/(x+1)^2=(2x-1)/x(x+1

(x²+xy)/(x+y)²=x(x+y)/(x+y)²=x/(x+y)2xy/(x+y)²x/(x²-y²)∵最简公分母为：(x+y)&#

x的平方-2x除以x的平方-4x+4=x(x-2)/(x-2)²=x/(x-2)

x^2+3x+1=0x1+x2=-3,x1x2=1,x1

很简单的问题,联系我,63415177

y=(3x²+2x+2)/(x²+x+1)yx²+yx+y=3x²+2x+2(y-3)x²+(y-2)x+(y-2)=0x是实数,所以判别式大于等于0

原式=x[2(x-2)-(x+2)]/(x+2)(x-2)*(x+2)(x-2)/x=2(x-2)-(x+2)=2x-4-x-2=x-6

X等于X1+X2+X3的平均数,也就是说X跟X1,X2,X3同时比较相近的时候Y取最小值.你可以举特例,假设X1=X2=X3.这在高2的不等式里会学的.不用担心

x1+x2=4x1x2=-1(x1+x2)^2/(1/x1+1/x2)=(x1+x2)^2*x1x2/(x1+x2)=x1x2*(x1+x2)=-4