19999*9999+19999等于多少

问题描述:

19999*9999+19999等于多少

200009998

19999*9999+19999
=19999*(10000-1)+19999
=199990000-19999+19999
=199990000

19999*9999+19999
=19999*(9999+1)
=19999*10000
=199990000