1. Яка з наведених рівностей
правильна?
A)5а+2b-7a=7ab-7a;
Б) 5а +2b-7a = 2b-2а;
B) 5а +2b-7a=10ab-7a;
г) 5а+2b-7a=-2a²+2b.​
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