①3.86+19.7+6.14
② + ÷
③28.26÷3.14×1.2
④ × ﹣ ÷
0×5.16= 9.8+2.6= 502-399=
÷4= × = 20×5=
3.12﹣+6.88﹣ 7÷25+×99
×[125%﹣(25%+)]