54.9x0.38怎么简便算

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54.9x0.38怎么简便算54.9x0.38怎么简便算54.9x0.38怎么简便算54.9X(0.4一0.02)原式=(55-0.1)X(0.4-0.02)=55X0.4-55X0.02-0.1X0

54.9x0.38怎么简便算
54.9x0.38怎么简便算

54.9x0.38怎么简便算
54.9X(0.4一0.02)

原式=(55-0.1)X(0.4-0.02)
=55X0.4-55X0.02-0.1X0.4+0.1X0.02
=22-1.1-0.04+0.002
=20.862