2.5乘以0.6减去1.8乘以0.5用简便方法怎么做

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2.5乘以0.6减去1.8乘以0.5用简便方法怎么做2.5乘以0.6减去1.8乘以0.5用简便方法怎么做2.5乘以0.6减去1.8乘以0.5用简便方法怎么做2.5×0.6-1.8×0.5=0.5×5×

2.5乘以0.6减去1.8乘以0.5用简便方法怎么做
2.5乘以0.6减去1.8乘以0.5用简便方法怎么做

2.5乘以0.6减去1.8乘以0.5用简便方法怎么做
2.5×0.6-1.8×0.5
=0.5×5×0.6-1.8×0.5
=0.5×3-1.8×0.5
=0.5×(3-1.8)
=0.5×1.2
=0.6