ребят выручите:-(
найдите значения выражения
2a+b+2a2+ab,если a=-1, b=998
7by+4b-14y-8? tckb y= 5\28, b=2\7 (дроби) 
5ab-7b+5a^2-7a, если a=3.7, b=-3.7
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