(а+5)²-а²=10а+25
(а+5)²=а²+10а+25
а²+10а+25-а²=10а+25
(a+5)²-a²=a²+10a+25-a²=10a+25
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(а+5)²-а²=10а+25
(а+5)²=а²+10а+25
а²+10а+25-а²=10а+25
(a+5)²-a²=a²+10a+25-a²=10a+25