75.4-12.81-11.09-23.1=?的简便方法!

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75.4-12.81-11.09-23.1=?的简便方法!
75.4-12.81-11.09-23.1=?的简便方法!

75.4-12.81-11.09-23.1=?的简便方法!
原式=75.4-(12.81+11.09+23.1)
=75.4-(23.9+23.1)
=75.4-47
=28.4
411-299=411-300+1
=111+1
=112