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.

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!!