如题所述
26 * 21 = 26 * (20 + 1) = 26 * 20 + 26 * 1 = 520 + 26 = 546
5400 / 36 = 54 * 100 / (4 * 9) = (54 / 9) * (100 / 4) = 6 * 25 = 150
13 * 99 = 13 * (100 - 1) = 13 * 100 - 13 * 1 = 1300 - 13 = 1287
5400 / 36 = 54 * 100 / (4 * 9) = (54 / 9) * (100 / 4) = 6 * 25 = 150
13 * 99 = 13 * (100 - 1) = 13 * 100 - 13 * 1 = 1300 - 13 = 1287
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第1个回答 2015-01-13
26*21=26*20+26=520+26=546
13*99=13*100-13=1300-13=1287
13*99=13*100-13=1300-13=1287
