用简便方法计算:5.6×2.9+3.1×5.6-2.8×2 怎么算?

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用简便方法计算:5.6×2.9+3.1×5.6-2.8×2 怎么算?

用简便方法计算:5.6×2.9+3.1×5.6-2.8×2 怎么算?
用简便方法计算:5.6×2.9+3.1×5.6-2.8×2 怎么算?

用简便方法计算:5.6×2.9+3.1×5.6-2.8×2 怎么算?
5.6×2.9+3.1×5.6-2.8×2
=5.6×2.9+3.1×5.6-5.6
=5.6×(2.9+3.1-1)
=5.6×5
=28