2100除以42怎么简便快,

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2100除以42怎么简便快,
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2100除以42怎么简便快,
2100除以42怎么简便
快,

2100除以42怎么简便快,

=2100÷(7×6)

=2100÷7÷6

=300÷6

=50

收起

2100÷(21×2)
=100÷2
=50

先用2100除以7=300,再用300除以6=50