Question

П О М О Г И Т Е ГОЛОВУ ЛОМАЮ

Answer 1

$m^2+2m-n^2+2n=(m-n)(m+n)+2(m+n)=(m+n)(m-n+2)\\\\Otvet:\;3$___________

$m=-0.1,\;\;n=-0.2\\\\(m+n)(m-n+2)->((-0.1)+(-0.2))((-0.1-(-0.2)+2))\\\\((-0.1)+(-0.2))((-0.1-(-0.2)+2))=(0.1)*2.1+(-0.2)*2.1=-0.1*2.1-0.2*2.1=2.1(-0.1-0.2)=2.1(-0.3)=-0.63\\\\Otvet:\;-0.63$