Question

54.9×0.38的简便算法是什么？

Answer 1

54.9×0.38的简便计算。
54.9×0.38
=6.1×9×0.38
=6.1×（3.8-0.38）
=6.1×3.42
=（6+0.1）×3.42
=20.52+0.342
=20.862

Answer 2

54.9x0.38
=（55-0.1）x0.38
=55x0.38-0.1x0.38
=20.9-0.038
=20.862

Answer 3

您好，计算如下，54.9×0.38=（55-0.1）×0.38=（50+5-0.1）×0.38=50×0.38+5×0.38-0.1×0.38

Answer 4

54.9x0.38

=(55-0.1)x(0.4-0.02)

=55x(0.4-0.02)-0.1x(0.4-0.02)

=55x0.4-55x0.02-0.1x0.4+0.1x0.02

=22-1.1-0.04+0.002

=20.862

Answer 5

第一种方法 54.9×0.38 =55x0.38-0.1x0.38 =20.9-0.038 =20.862 2、第一种方法
54.9×0.38
=55x0.38-0.1x0.38
=20.9-0.038
=20.862
2、第二种方法：
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