5(3-5а)²-5(3а-7)(3а+7)
(а+1)²+3(а-1)²-5(а+1)(а-1)
(m-1)²-4(m+1)²-6(m+1)(m-1)
5(1-y)²(3+y)²-3(1-y)(1+y)
5(1-+m)(1-m)-(2-m)³-8(1-m)

Докажите , что:
80³-50³ делиться на  300
75³+65³ делиться на 700 
87³+32³ делиться на 119
84³+24³ делиться на 1944


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