9999*9999+1999用脱式简便计算
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9999*9999+1999用脱式简便计算
9999*9999+1999
用脱式简便计算
9999*9999+1999用脱式简便计算
9999*9999+1999
=9999*(10000-1)+1999
=99990000-9999+1999
=99990000-8000
=99982000
=(10000-1)(10000-1)+1999
=10000*10000-10000-10000+1+1999
=100000000-20000+2000
=99982000
=(10000-1)(10000-1)+1999
=10000*10000-10000-10000+(1+1999)
=100000000-20000+2000
=99982000