1.85﹣+= 1÷×= +0.375=
2.4﹣= (+)×2.4= 5÷×5÷=
10×45%= 1.25×8= 40×(1﹣20%)=
15+8= ﹣0.3= 13×0.6= 2.8÷0.7=
×= ÷2= += 52=
1﹣+= 1÷×= 0.5﹣+0.5﹣=
8.1+= (+)×24= 7××7÷=