简算9999*7777+3333*6666
问题描述:
简算9999*7777+3333*6666
答
解 9999*7777+3333*6666
=1111*1111*9*7+1111*1111*3*6
=1111*1111(9*7+3*6)
=1111*1111*(63+18)
=1111*1111*81
=9999*9999
=(10000-1 )*9999
=99990000-9999
=99980001
答
9999*7777+3333*6666
=3333*3*7777+3333*3333*2
=(3333)*(3*7777+3333*2)
=(3333)*(3*7777+2222*3)
=(3333)*(3*9999)
=9999*9999
=99980001
有更简便的吗- -
答
原式=9999*7777 (3333*3)*2222
=9999*7777 9999*2222
=9999*(7777 2222)
=9999*9999
=9999*(10000-1)
=9999*10000-9999*1
=99990000-9999
=99980001