Question

ДАЮ 20 БАЛЛОВ!!!

$\frac{a^{2} -b ^{2} }{a ^{2} +2ab+b ^{2} } : \frac{a ^{2}-2ab+b ^{2} }{a+b} ,$ если a=120, b=80

Answer 1

=1/(a-b)=1/(120--80)=1/40