Question

求多项式5ab^2-2a^2b-3[ab^2-2(2ab^2+a^2b)]的值,其中a、b满足/a+1/+(b-2)^2

Answer 1

/a+1/+(b-2)^2=0

∴a+1=0

b-2=0

∴a=-1 b=2

5ab^2-2a^2b-3[ab^2-2(2ab^2+a^2b)]

=5ab²-2a²b-3ab²+12ab²+6a²b

=14ab²+4a²b

=-14*4+4*2

=-48