简便计算5.6*4.9 5.1*4.4
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简便计算5.6*4.9 5.1*4.4
5.6x4.9
=5.6x(5-0.1)
=5.6x5-5.6x0.1
=28-0.56
=27.44
5.1x4.4
=5x4.4+0.1x4.4
=22+0.44
=22.44
5.6x4.9
=5.6x(5-0.1)
=5.6x5-5.6x0.1
=28-0.56
=27.44
5.1x4.4
=5x4.4+0.1x4.4
=22+0.44
=22.44
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