已知a-b=3,ab=2,求a^2+b^2的值

2024-12-15 19:31:31
推荐回答(5个)
回答1:

a-b=3,ab=2
a^2-2ab+b^2=9
a^2+b^2=9+2ab
a^2+b^2=9+2*2
a^2+b^2=13

回答2:

a^2+b^2
=(a-b)^2+2ab
=3^2+4
=13

回答3:

a=b+3代入ab=2可求啊、b的值

回答4:

a^2+b^2=(a-b)^2+2ab=9+4=11

回答5:

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