54.38-(19.5+4.38) 简便

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54.38-(19.5+4.38) 简便
54.38-(19.5+4.38) 简便

54.38-(19.5+4.38) 简便
54.38-(19.5+4.38)
=54.38-19.5-4.38
=(54.38-4.38)-19.5
=50-19.5
=30.5

54.38-(19.5+4.38)
=54.38-4.38-19.5
=50-19.5
=30.5

54.38-(19.5+4.38)
=54.38-4.38-19.5
=50-19.5
=30.5

=54.38-4.38-19.5
=50-19.5
=30.5