7.5×9.9递等式,简便计算
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![7.5×9.9递等式,简便计算](/uploads/image/z/975107-11-7.jpg?t=7.5%C3%979.9%E9%80%92%E7%AD%89%E5%BC%8F%2C%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97)
7.5×9.9递等式,简便计算
7.5×9.9递等式,简便计算
7.5×9.9递等式,简便计算
7.5×9.9
=7.5×(10-0.1)
=75-0.75
=74.25
可以运用乘法分配率
7.5×9.9
=7.5×(10-0.1)
=7.5×10-7.5×0.1
=75-0.75=74.25
7.5×10-0.75
=7.5×(10-0.1)
=7.5×10 -7.5×0.1
=75-0.75
=74.25
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