54.9×0.38…………求简便运算!
人气：327 ℃ 时间：2019-12-17 16:42:00
解答
54.9X0.38=(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蟹蟹no
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