докажите, что при любом целом m значение выражения
(m+1)(m+3)-(1-7m)(1+7m)-(2-m) кратно 5
(m+1)(m+3)-(1-7m)(1+7m)-(2-m)=m2+3m+m+3-1-7m+7m+49m2-2=m=50m2+5m
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(m+1)(m+3)-(1-7m)(1+7m)-(2-m)=m2+3m+m+3-1-7m+7m+49m2-2=m=50m2+5m