1.若x^2+3x+1=6则x^2+1/x^2=?2.若2x/(x^2-4)=A/(x+2)+B/(x-2) 则A=?B=?

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1.若x^2+3x+1=6则x^2+1/x^2=?2.若2x/(x^2-4)=A/(x+2)+B/(x-2)则A=?B=?1.若x^2+3x+1=6则x^2+1/x^2=?2.若2x/(x^2-4)=

1.若x^2+3x+1=6则x^2+1/x^2=?2.若2x/(x^2-4)=A/(x+2)+B/(x-2) 则A=?B=?
1.若x^2+3x+1=6则x^2+1/x^2=?2.若2x/(x^2-4)=A/(x+2)+B/(x-2) 则A=?B=?

1.若x^2+3x+1=6则x^2+1/x^2=?2.若2x/(x^2-4)=A/(x+2)+B/(x-2) 则A=?B=?
1)x^2+3x+1=6?……估计6是0不是我也不会
x^2+3x+1=0(同除x）
x+3+1/x=0
x+1/x=-3
x^2+1/x^2+2=9
x^2+1/x^2=7
2)2x/(x^2-4)=2x/(x+2)(x-2)=1/(x+2)+1/(x-2)=A/(x+2)+B/(x-2)
比较得A=1,B=1

*-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X || 填九宫格帮帮忙.x x 6 x x 7 x x 98 x x x 3 x 1 x x 9 x x 6 x 5 x 3 x x x 3 x x x x 1 8x x x 9 x 1 x x x2 1 x x x x 6 x x x 6 x 7 x 3 x x 1 x x 9 x 2 x x x 47 x x 8 x x 5 x x 若x=300,则x/x-3-(x+6)/x^2-3x+1/x的值为? 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 3X*X-2X+6=8,X=?3X*X-2X+6=8，X=？则代数式1.5X*X-X+1=? 已知x=2π+1.求(X-1)+(X-2)+(X-3)+(X-4)+(X-5)+(X-6)+(X-7)+(X-8)+(X-9)+(X-10) 解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6) x+2/x+1-x+4/x+3=x+6/x+5-x+8/x+7 x=? 若x+x^2+x^3=-1 则x^2012+x^2011+x^2010+x^2009+…………+x^3+x^2+x+1= 若x^3+x^2+x+1=0,则x^-27+x^-26+x^-25+……+x^-1+1+x+……+x^26+x^27 1.用公式计算：COSX=1-X*X/2!X*X*X*X/4!-X*X*X*X*X*X/6!.直到最后一项的绝对 1.(1/X-1 )-2=X^-3X/X^-12.（X/X+1)^+5(X/X+1)+6=03.（8(X^+2X)/X^-1）+ 3（X^-1)/X^+2x 若x=1/x,则(x²2-6x+9)/(x-3)÷(x+3)/（x²+6x+9）的值是若x=-0.279.则|x-1| |x-3|=.|x-2001|-|x|-|x-2|...-|x-2000|值多少若x=-0.279,则|x-1|+|x-3|+.+|x-2001|-|x|-|x-2|-.-|x-2000|值为多少急 x/x-2+x-9/x-7=x+1/x-1+x-8/x-6, x/x-2+x-9/x-7=x+1/x-1+x-8/x-6, (X+1)X(X+2)X(X+3)=504