12345乘以99999等于几

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12345乘以99999等于几
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12345乘以99999等于几
12345乘以99999等于几

12345乘以99999等于几
1234487655
把计算器放在手里,用锤子一砸,就出来了

1234487655
简便算法:
12345*99999
=12345*(100000-1)
=12345*100000-12345
=1234500000-12345
=1234487655

12345*99999=12345*(100000-1)=1234500000-12345

1+99999=100000

2+99998=100000.....

99999/2....