82乘99 52.7乘101 简便计算,急!如题.
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![82乘99 52.7乘101 简便计算,急!如题.](/uploads/image/z/2002369-49-9.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%E5%A6%82%E9%A2%98.)
82乘99 52.7乘101 简便计算,急!如题.
82乘99 52.7乘101 简便计算,急!
如题.
82乘99 52.7乘101 简便计算,急!如题.
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*100-82=8112
52.7*100+52.7=5322.7
82*99=82*(100-1)
=82*100-82*1
= 8200-82
=8118
52.7*101=52.7*(100+1)
=52.7*100+52.7*1
=5270+52.7
=5322.7
82×99
=82×(100-1)
=82×100-82
=8200-82
=8118
52.7×101
=52.7×(100+1)
=52.7×100+52.7
=5270+52.7
=5322.7
82+99=82(100-1)=8200-82=8118 乘号打不了啦!!