a) (3+xy2)2
=32+2.3.xy2+(xy2)2
=9+6xy2+x2y4
Vậy ...
b) (10−2m2n)2
=102−2.10.2m2n+(2m2n)2
=100−40m2n+4m4n2
Vậy ...
c) (a−b2)(a+b2)
=a2−(b2)2
=a2−b4
Vậy ...
a) \(\left(xy^2+3\right)^2=x^2y^4+6xy^2+9\)
b) \(\left(10-2m^2n\right)^2=100-40m^2n+4m^4n^2\)
c) \(\left(a-b^2\right)\left(a+b^2\right)=a^2-b^4\)