Question

整式与分式若a>0且a的x次方=2,a的y次方=3,则a的x次方+a的y次方的值为?已知a-b=3,ab=2,则a²+b

Answer 1

1,a^x=2,a^y=3,a^x+a^y=5

2,a^2+b^2=a^2-2ab+b^2+2ab=(a-b)^2+2ab=9+4=13