999 x 998998999 - 998 x 999999998x=乘号要全过程啊····要简算

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999x998998999-998x999999998x=乘号要全过程啊····要简算999x998998999-998x999999998x=乘号要全过程啊····要简算999x998998999-

999 x 998998999 - 998 x 999999998x=乘号要全过程啊····要简算
999 x 998998999 - 998 x 999999998
x=乘号
要全过程啊····
要简算

999 x 998998999 - 998 x 999999998x=乘号要全过程啊····要简算
=999 x (998998998+1) - 998 x (999999999 -1)
=(999 x 998 x 1001001 +999)-(998 x 999 x1001001 -998)
=998 + 999
=1997

1997

1997

999 x 998998999 - 998 x 999999998
=998998999+998*(998998999 - 999999998)
=998998999+998*(-1000999)
=998*1001001+1+998*(-1000999)
=998*(1001001-1000999)+1
=998*2+1
=1997

1997

1996