54.9x0.38的简便算法怎么算
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54.9*0.38
=(55-0.1)*0.38
=55*0.38-0.1*0.38
=55*(0.4-0.02)-0.038
=55*0.4-55*0.02-0.038
=22-1.1-0.038
=20.9-0.038
=20.862
=(55-0.1)*0.38
=55*0.38-0.1*0.38
=55*(0.4-0.02)-0.038
=55*0.4-55*0.02-0.038
=22-1.1-0.038
=20.9-0.038
=20.862
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