丌x(6÷2)的平方xX=117丌-4分之450丌-搜答案-搜搜考试网

(1)9-0.1X>=-1①1-0.2X=0③由②得,X＞3由③得,X≤6∴此不等式的解集为3＜X≤6(6)3X+2>=2X①X-43X③由①得,X≥-2由②得,X＜7由③得X＜1.2∴此不等式的解集

xxxx－xxx－5xx－7x＋5＝(xx－2x－1)(xx＋x－2)－10x＋3＝－10x＋3由xx－2x－1＝0得x＝1±√2所以,xxxx－xxx－7x＋5＝－7±10√2

（m-x)(-x)-(x+m)(-n)=5x+xx(就是x的平方）-6-mx+x^2+nx+mn=x^2+5x-6x^2+[n-m]x+mn=x^2+5x-6n-m=5mn=-6m(n-1)+n(m+

2

3x（x+2)+(x+1)(x-1)=4(xx+2)3x²+6x+x²-1=4x²+86x=8+16x=9x=3/2

题目打好点..看糊涂了

方程左边1/(xx+x)+1/(xx+3x+2)+1/(xx+5x+6)+1/(xx+7x+12)+1/(xx+9x+20)对分母因式分解得1/x（x+1)+1/（x+1）(x+2)+1/(x+2)(

x的平方-6x+9/9-x的平方÷2x-6/x的平方+3x{(x-3)²/[(3-x)(3+x)]}÷{2(x-3)/[x(x+3)]}=[(3-x)/(3+x)]÷{2(x-3)/[x(x

xx+5x-998=0即X^2+5X-998=0X^2+5X=998xxx+6xx-993x+1008=X^3+5X^2-998X+X^2+5X+1008=X(X^2+5X-998)+(X^2+5X)

2/9再问：过程，谢谢再答：由题目得y/x=2/3xy/xx+yy-yy/xx-yy=y/x-(y/x)²=2/3-4/9=2/9

x/(xx+x+1)=a分子分母除以x,1/(x+1+1/x)=a,x+1/x=1/a-1,两边平方xx+2+1/xx=(1/a-1)^2xx+1/xx=(1/a-1)^2-2xx/(xxxx+xx+

(x^2-2x)^2-5(x^2-2x)-6=(x^2-2x-6)(x^2-2x+1)=(x^2-2x-6)(x-1)^2=0所以x-1=0或者x^2-2x-6=0x^2-2x-6=0x^2-2x+1

xx+yy+4x-6y+13=0整理得：(x+2)^2+(y-3)^2=0那么只有(x+2)=0(y-3)=0x=-2y=3(x^2-2x)/(x^2+3y^2)=(4+4)/(4+3*9)=8/31

x^2+x-x^2-y=3x-y=3(x-y)^2=9x^2+y^2-2xy=9(x^2+y^2)/2-xy=9/2

(3x²-x-2)²=(2x²+4x-8)²-(x²-5x+6)²(3x²-x-2)²=[(2x²+4x-8)

47再问：求过程！再答：(3/2)x^2-x+16+2=45+2=47再答：我错了再答：55再问：发来再答：(3x^2-2x)=74(3x^2一2x)÷2+18=55再问：如果够项式2a的平方+3a+

原式=5x^2-2(3y^2-5x^2)+(-4y^2+7xy)=5x^2-6y^2+10x^2-4y^2+7xy=(1+10)x^2-(6+4)y^2+7xy=11x^2-10y^2+7xy

x^2-2x+y^2+6y+10=0(x-1)^2+(y+3)^2=0所以x=1,y=-3x+y=-2x^2表示x的平方

（1）27*3=816*9=54（2）56/7=89/3=12/4

x(x+1)-(xx+y)=-3x^2+x-x^2-y=-3x-y=-3(xx+yy)/2-xy=(x^2+y^2-2xy)/2=(x-y)^2/2=(-3)^2/2=9/2再问：是对的吧！再答：当然