1 дм = 10 см
1 дм 4 см + 5 см = (1 * 10 + 4) + 5 = 14 + 5 = 19 см = 1 дм 9 см
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1 дм = 10 см
1 дм 4 см + 5 см = (1 * 10 + 4) + 5 = 14 + 5 = 19 см = 1 дм 9 см