Ответ:
a²+2ab+b2+3a+3b=(a+B)²+3a+3b
2 4/4=3
(7 3/7) ²+3*4 3/7+3*3 = 55 9/49+13 2/7 + 9 = 77 13/49
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Verified answer
Ответ:
a²+2ab+b2+3a+3b=(a+B)²+3a+3b
2 4/4=3
(7 3/7) ²+3*4 3/7+3*3 = 55 9/49+13 2/7 + 9 = 77 13/49