巧算3(三年级奥数题及答案)(2)
学而思奥数网(原创)
2010-11-25 16:19:31
解答:①式=100+10+20+30
=160
②式=100-10-20-30
=40
③式=100-30+10
=80

解答:①式=100+10+20+30
=160
②式=100-10-20-30
=40
③式=100-30+10
=80
