直接写得数.0.25×40= 10.6﹣5.02= += ﹣=7.6÷0.38= ×= 2﹣+= 2.8×25+1.2×25=
列式计算。①比4.5的1.6倍小0.72数是多少?②什么数的40%加上后得12?
计算下列各题,能简算的要简算。38.75﹣15.38+61.25﹣4.62;;×9.3+9.3×2.25=; 4.05﹣2.83﹣0.17
求未知数x.x+x=x﹣=x﹣=×24
直接写得数。()×2= 28×25= = 25+15×=0.75×= = ﹣|﹣|= (+4.5)+(﹣4.5)=