8400÷124×31(巧算)
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8400÷124×31(巧算)
8400÷124×31(巧算)
8400÷124×31(巧算)
8400÷124×31
=8400÷(4x31)x31
=8400x1/4x1/31x31
=8400x1/4x(1/31x31)
=2100x1
=2100
8400÷124×31
=2100×4×31÷124
=2100×﹙124÷124﹚
=2100
8400÷124×31
=8400*31/124
=2100*4*31/124
=2100
8400/(124/31)=8400/4=2100
8400÷124×31(巧算)
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