82乘99 52.7乘101 简便计算,急!
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82乘99 52.7乘101 简便计算,急!
如题.
如题.
![82乘99 52.7乘101 简便计算,急!](/uploads/image/z/7594886-38-6.jpg?t=82%E4%B9%9899+52.7%E4%B9%98101+%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97%2C%E6%80%A5%21)
82*99 52.7*101
=82*(100-1) =52.7*(100+1)
=82*100-80*1 =52.7*100+52.7*1
=8200-80 =5270+52.7
=8120 =5322.7
=82*(100-1) =52.7*(100+1)
=82*100-80*1 =52.7*100+52.7*1
=8200-80 =5270+52.7
=8120 =5322.7