т.к (a-b) ²=a²-2ab+b² значит
(1/16x5-9/10)²=1/256x7-9/80x5+81/100
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т.к (a-b) ²=a²-2ab+b² значит
(1/16x5-9/10)²=1/256x7-9/80x5+81/100