5.6*2.9-5.6+8.1*5.6巧算
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5.6*2.9-5.6+8.1*5.6巧算5.6*2.9-5.6+8.1*5.6巧算5.6*2.9-5.6+8.1*5.6巧算5.6*2.9-5.6+8.1*5.6=5.6*（2.9-1+8.1）=5
5.6*2.9-5.6+8.1*5.6巧算
5.6*2.9-5.6+8.1*5.6巧算
5.6*2.9-5.6+8.1*5.6巧算
5.6*2.9-5.6+8.1*5.6
=5.6*（2.9-1+8.1）
=5.6*10
=56
5.6*（2.9-1+8.1）=5.6*（2.9+8.1-1）=5.6*（11-1）=5.6*10=56
5.6*2.9-5.6+8.1*5.6
=5.6×2.9-5.6+8.1×5.6
=5.6×(2.9-1+8.1)
=5.6×10
=56