2.5 * 38 * 40 = (2.5 * 40) * 38 = 100 * 38 = 3800
3.7*5.81 + 3.7*4.19 = 3.7*(5.81 + 4.19) = 3.7 * 10 = 37
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2.5 * 38 * 40 = (2.5 * 40) * 38 = 100 * 38 = 3800
3.7*5.81 + 3.7*4.19 = 3.7*(5.81 + 4.19) = 3.7 * 10 = 37