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?5
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