Question

一道数学题``望大家看一下```急急急```

Answer 1

(a^2+b^2)(x^2+y^2)

=a^2x^2+a^2y^2+b^2x^2+b^2y^2

=(a^2x^2+2abxy+b^2y^2)+(a^2y^2-2abxy+b^2x^2)

=(ax+by)^2+(ay-bx)^2

=3^2+5^2

=34