вычисли разными способами 7*7-7*2, 7*7-7*3,7*7-7*4,7*7-7*5,8*8-8*2,8*8-8*3,8*8-8*4,8*8-8*5,9*9-9*2,9*9-9*3,9*9-9*4,9*9-9*5.
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