Question

упростите выражение - ( m+n)²+( m-n)²

Answer 1

(m+n)^2 + (m-n)^2 = m^2 + 2mn + n^2 + m^2 - 2mn + n^2 = 2m^2 + 2n^2

Answer 2

( m+n)²+( m-n)²=

=m²+2mn+n²+m²-2mn+n²=

=2m²+2n²