Question

第五题，求解。初三数学

Answer 1

x2/x1+x1/x2=(x1^2+x2^2)/(x1*x2)=[(x1+x2)^2-2*x1*x2]/(x1*x2)
由题可知 x1+x2=-3
x1*x2=-3
所以答案B

Answer 2

5
x1+x2=-3
x1x2=-3

x2/x1 +x1/x2
=(x2^2+x1^2)/x1x2
=[(x1+x2)^2-2x1x2]/x1x2
=[(-3)^2-2*(-3)] / (-3)
=(9+6)/(-3)
=-5
选B