0,3mn(1,5 - 6bc + 7b - 10c) =
= 0,45mn - 1,8mnbc + 2,1mnb - 3mnc
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0,3mn(1,5 - 6bc + 7b - 10c) =
= 0,45mn - 1,8mnbc + 2,1mnb - 3mnc