如题所述
第1个回答 2020-05-23
简便运算
39*101
=39*(100+1)
=39*100+39*1
=3900+39
=3939
39*101
=39*(100+1)
=39*100+39*1
=3900+39
=3939
第2个回答 2020-05-23
39×101
=39×(100+1)
=39×100+39
=3900+39
=3939
=39×(100+1)
=39×100+39
=3900+39
=3939
第3个回答 2020-05-23
39x101
=39x(100+1)
=39x100+39x1
=3900+39
=3939
=39x(100+1)
=39x100+39x1
=3900+39
=3939
第4个回答 2020-05-23
39×101=39×(100+1)=39×100+39×1=3900+39=3939