Question

已知a+b=2,ab=2,求2/1a的三次方b+a的平方b的平方+2/1ab的三次方的值

Answer 1

a+b=2,a^2+b^2+2ab=4, a^2+b^2=0 ab=2,

(1/2)a^3b+a^2b^2+(1/2)ab^3=(1/2)ab(a^2+b^2)+(ab)^2=4