42,8*7-2,8*7 = 7*( 42.8 - 2.8) = 7*40 = 280
42,8 * 7/10 - 2,8 * 7/10 = 7/10 * (42,8 - 2,8) =
= 7/10 * 40 = (10 и 40 сокращаем) = 7 * 4 = 28
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42,8*7-2,8*7 = 7*( 42.8 - 2.8) = 7*40 = 280
42,8 * 7/10 - 2,8 * 7/10 = 7/10 * (42,8 - 2,8) =
= 7/10 * 40 = (10 и 40 сокращаем) = 7 * 4 = 28