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2) 2× (7 - 5b ) + 15 - 3 × ( 2 + 5 1/4c ), якщо с = 0,5, b = 2
4) 1,6 (1/8m + 2,5n ) - ( 4,5n - 1 1/4m ) × (-2) - (-12m + 14n ), якщо m = 0,25, n = 5,7
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