12.5×6.7875×1/8+1.25×678.75×0.125的简便计算
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12.5×6.7875×1/8+1.25×678.75×0.125的简便计算是
=12.5×6.7875×1/8+1.25×678.75×1/8
=0.125×678.75×1/8+1.25×678.75×1/8
=（0.125+1.25）×678.75×1/8
=(1/8+5/4)×678.75×1/8
=11/8×678.75×1/8
=11/8×1/8×(678+0.75)
=11/64×(678+3/4)
=11/64×678+11/64×3/4
=11/32×339+33/256
=12.5×6.7875×1/8+1.25×678.75×1/8
=0.125×678.75×1/8+1.25×678.75×1/8
=（0.125+1.25）×678.75×1/8
=(1/8+5/4)×678.75×1/8
=11/8×678.75×1/8
=11/8×1/8×(678+0.75)
=11/64×(678+3/4)
=11/64×678+11/64×3/4
=11/32×339+33/256
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