0.78×6.2-0.62×6.8简便计算?
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0.78×6.2-0.62×6.8
=0.78×6.2-6.2×0.1×6.8
=0.78×6.2-6.2×0.68
=6.2×(0.78-0.68)
=6.2×0.1
=0.62
=0.78×6.2-6.2×0.1×6.8
=0.78×6.2-6.2×0.68
=6.2×(0.78-0.68)
=6.2×0.1
=0.62
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