简便方法,谢谢
2016-09-02
展开全部
=(168×13+163×4)/165
=[(165+3)×13+(165-2)×4]/165
=(165×17+3×13-2×4)/165
=(165×17+31)/165
=17+31/165
=17又31/165
=[(165+3)×13+(165-2)×4]/165
=(165×17+3×13-2×4)/165
=(165×17+31)/165
=17+31/165
=17又31/165
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