Then x+ 1/x = 3.
x? /x fourth power +X? + 1= 1/X? +X? + 1= 1/X? +X? +2- 1
=(X+ 1/X)? - 1=3? - 1=8
2.(X-Y+4XY/X-Y)×(X+Y-4XY/X+Y)
=[(x-y)^2+4xy]/(x-y)×[(x+y)^2-4xy]/(x+y)
=(X+Y)^2/(X-Y)×(X-Y)^2/(X+Y)
=(X+Y)(X-Y)=X^2-Y^2
3. Because the equation (1-M)X=M-2X has only one negative number, we can get (3-M)X=M from (1-m) x = 2x.
So X=M/(3-M)
Because the solution is negative. Then M & gt0.3 m<0 or m
Then M>3 or M
4: A+ 1/A = 6, then (A+ 1/A)? = 36 ,
Answer? + 1/A? =34
Answer? + 1/A? -2=32
(A- 1/A)? =32
A- 1/a = 4 * radical number 2 or -4* radical number 2.
5:K=-6
6: 10
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