设X1X2是方程2x²+4x-3=0的两根。
满足 x1+x2 = -2 x1x2 = -3/2
求(x1+2)*(x2+2)
= x1x1 + 2 (x1+x2) +4
= -3/2 - 4 +4
= -2分之3
x2/x1+x1/x2
= (x1²+x2²) /x1x2
=[ (x1+x2) ² - 2x1x2 ] /x1x2
= ( 4 + 3 ) / (-3/2 )
= 7 x ( -2/3)
= - 3分之 14
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