Вычислите рациональным способом.
(0,9 * 5 + 5 * 0,6) - (0,7 * 2 + 3 * 0,7)=
(13 * 2,5 - 2,5 * 9) + ( 8 * 5,6 - 3,1 * 8)=
(3,61 * 7 + 7 * 1,3) - (2,26 * 4 + 3 * 2,26) =
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