Question

小学四年级奥数题乘除法简便运算

99999*77778+33333*66666
用简便法计算

Answer 1

原题=99999*77778+（33333*3）*(66666/3)
=99999*77778+99999*22222
=99999*(77778+22222)
=99999*100000
=9999900000

Answer 2

99999*77778+33333*66666
=99999*77778+33333*3*22222
=99999*77778+99999*22222
=99999*(77778+22222)
=99999*100000
=9999900000

(谢绝抄袭)

Answer 3

拆77778
9*7*11111*11111+9*11111+9*2*11111*11111合并
=81*11111*11111+9*11111
=888880*11111+11120*11111拆81
=1000000*11111
=11111000000

Answer 4

99999*77778+33333*66666
=33333*3*77778+33333*66666
=33333*(3*77778+66666)
=33333*(3*77778+3*22222)
=33333*<3*(77778+22222)
=33333*3*100000
=9999900000

Answer 5

99999*77778+33333*66666
=99999*77778+99999*22222
=99999*（77778+22222）
=99999*100000
=9999900000