因为x2+2x-15=0 解得x=-5, or x=3 (1-2/x)÷(x2-4x+4)/(x-4)-(x+4)/(x+2) =(x-2)/x ×(x-4)/(x-2)^2-(x+4)/(x+2) =(x-4)/[x(x-2)]-(x+4)/(x+2) 当x=-5时, (x-4)/[x(x-2)]-(x+4)/(x+2) =-9/35-(-5+4)/(-5+2) =-9/35-1/3 =-27/105-35/105 =-62/105 当x=3时, (x-4)/[x(x-2)]-(x+4)/(x+2) =(3-4)/(3×1)-(3+4)/(3+2) =-1/3-7/5 =-5/15-21/15 =-26/15 =-1又11/15
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