Question

计算下面各题你认为怎样简便就怎样算54.9*0.38

Answer 1

计算下面各题你认为怎样简便就怎样算
54.9x0.38

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
=22-1.14+0.002
=20.86+0.002

=20.862

感觉我这样计算更复杂了！

Answer 2

54.9×0.38
=(55-0.1)×0.38
=55×0.38-0.038
=50×0.38+5×0.38-0.038
=50×19/50+5×0.38-0.038
=19+1.9-0.038
=20.862

Answer 3

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 =22-1.14+0.002 =20.86+0.002 =20.862 ...

Answer 4

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 =22-1.14+0.002 =20.86+0.002 =20.862 ...

Answer 5

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