已知,a+b=3,ab=-2,求b⼀a+a⼀b的值?急求。过程

2024-12-31 18:04:24
推荐回答(2个)
回答1:

b/a+a/b
=ab*(b/a+a/b)
=b^2+a^2
=(a+b)^2-2ab
=3^2+2*(-2)
=3^2-4
=9-4=5
不好意思刚才写错了
希望对你有帮助~

回答2:

b/a+a/b
=b^2/(ab)+a^2/(ab)
=(a^2+b^2)/(ab)
=(a^2+b^2+2ab-2ab)/(ab)
=[(a^2+b^2+2ab)-2ab]/(ab)
=[(a+b)^2-2ab]/(ab)
=[3^2-2*(-2)]/(-2)
=(9+4)/(-2)
=-13/2