x的平方-2x分之x 2 减去 x的平方-4x 4分之x-1-搜答案-百度作业网

√x-√(1/x)=2两边平方x-2×√x×√(1/x)+1/x=2²x-2+1/x=4x+1/x=6所以(1+x²)/x=1/x+x²/x=1/x+x=6

负2.根据题意,分子为零.解出X等于3或者－2,又因为分母不为零,即X≠3.所以X＝－2.记得采纳啊

2011再问：能不能打下过程再答：x的平方减去5x=2007x-2分之(x-2)的三次方-(x-1)的平方加1=（x-2)^2-x=x^2-5x+4=2007+4=2011

x^2-3x+2=0(x-2)(x-1)=0x=2或x=1当x=2时x^2+1/x^2=2^2+1/2^2=4+1/4=17/4当x=1时x^2+1/x^2=1^2+1/1^2=1+1=2

由2x^2-3x-4=0得：x^2-2=3x/2所以x-2/x=(x^2-2)/x=(3x/2)/x=3/2

=(x+1)/x*(2x)^2/(x+1)^2-(2/x^2-1)=4x/(x+1)-2/(x^2-1)=(4x^2-4x-2)/(x^2-1)再问：*和^是什么意思？

(x^2-2x)/(x^2-x-6)≥1(x^2-2x)/(x^2-x-6)-1≥0{(x^2-2x)-(x^2-x-6)}/(x^2-x-6)≥0(x^2-2x-x^2+x+6)/(x^2-x-6)

根号下大于等于0x²-4>=0,x²>=44-x²>=0,x²

如果问题是：1／2（x的平方＋y的平方）－xy=2

2/(x-y)-(x+y)/(x-y)^2=[(2x-2y)-(x+y)]/(x-y)^2=(x-3y)/(x-y)^2

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)(

(x^2-4y^)\(x+y)^2乘以2x(x+y)/(x+2y)=2x(x-2y)\(x+y)

2x的平方减去2分之1等于02x^2=1/2x1=1/2,x2=-1/2

x/（2-x）-（2+x）.（2-x）/（（x+2）（x+2））=x/（2-x）-（2-x）/（x+2）=（6x-4）/（4-xx

2x/9-7x²/27=16两边乘277x²-6x+432=0判别式=(-6)²-4×7×432

x^2-2x-3=(x+1)(x-3)2x^2-x-1=(2x+1)(x-1)x^2+3x-4=(x-1)(x+4)3x^2-8x-3=(3x+1)(x-3)

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

【x/（x-2）】-1/（x平方-4）=1【x/（x-2）】-1/【（x-2）（x+2)】=1x(x+2)-1=（x-2）（x+2)x^2+2x-1=x^2-42x=-3x=-1.5

x/(x-3)-(x+6)/(x^2-3x)+1/x=[x^2-(x+6)+(x-3)]/x(x-3)=(x^2-9)/x(x-3)=(x+3)/x.

X^2/X-2-X/X-2-1+X/2-XX^2-X/X-2-1+X/2-XX^2-X/X-2+1+X/X-2X^2-1/X-2这么简单的题咋能用此乃的口吻～?比我还悲伤