39×98+78简便计算

2024-11-01 13:32:06
推荐回答(5个)
回答1:


回答2:

39×98+78
=39x(100-2)+78
=39x100-39x2+78
=3900-78+78
=3900

回答3:

=39x98+39x2
=39x(98+2)
=39x100
=3900

回答4:

39×98+78
=39x98+39x2
=39x(98+2)
=39x100
=3900

回答5:

39×98+78怎么简便计算