+ ÷
18÷ = ×0.15= × = 6.8÷10%= (1+20%)×(1+30%)=
×75%= 2﹣ ÷ = 62﹣52= 3.6× + ×3.6= 3+5+7+9+11+13+15=
① × ÷
② ÷[( + )× ]
③2﹣ ÷ ﹣
④ ÷5+5÷
⑤ ÷( ﹣ × )
⑥ ×58+42÷8﹣12.5%