7.8乘以0.64减去6.4乘以0.38的简便方法是怎样的

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7.8乘以0.64减去6.4乘以0.38的简便方法是怎样的7.8乘以0.64减去6.4乘以0.38的简便方法是怎样的7.8乘以0.64减去6.4乘以0.38的简便方法是怎样的7.8x0.64-6.4x

7.8乘以0.64减去6.4乘以0.38的简便方法是怎样的
7.8乘以0.64减去6.4乘以0.38的简便方法是怎样的

7.8乘以0.64减去6.4乘以0.38的简便方法是怎样的
7.8x0.64-6.4x0.38
=7.8x0.64-0.64x3.8
=0.64x(7.8-3.8)
=0.64x4
=2.56