129-69-31十7✀简便方法

2026-05-19 07:14:44
推荐回答(4个)
回答1:

129-69-31十7
=(129+7)-(69+31)
=136-100
=36

回答2:

129-69-31十7
=130-1-70+1-30-1+7
=130-100+6
=30+6
=36

回答3:

129-69-31+7
=129+7-(69+31)
=136-100
=36

回答4:

129-69-31+71
=129+71-(69+31)
=200-100
=100