69+12= 88-69= 70-45= 35+(67-18)=
9+78= 38+44= 57-19= 6+52-26=
参加跳远的有:①⑥⑨⑪⑮⑳
参加跑步的有:①⑤⑥⑨⑮
- = × = 80÷10%= 42×3.14=
30%+0.45= 3.6÷0.18= 2- = 6- - =