98×39+78的简便计算竖式怎么列?

2024-12-03 19:08:12
推荐回答(2个)
回答1:

=49×2×39+78
=49×78+78
=78×(49+1)
=78×50=3900

回答2:

解:原式=98x39+39x2
=39x(98+2)
=39x100
=3900