а(а+2b)-(b+a) во 2 степени
упроститее
(а2+2ab)-(b2+2ab+a2)= a2+2ab-b2-2ab-a2= -b2
a(a-2b)-(b+a)2= a2 - 2ab - b2-2ab-a2= -4ab -b2
(a2 и -a2 сокращаем)
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(а2+2ab)-(b2+2ab+a2)= a2+2ab-b2-2ab-a2= -b2
a(a-2b)-(b+a)2= a2 - 2ab - b2-2ab-a2= -4ab -b2
(a2 и -a2 сокращаем)