用500粒玉米做发芽测验,有15粒没有发芽,发芽率是多少?
直接写得数30﹣19.02= 1﹣0.94+0.06= 3.125+1= 1×5÷×=1÷0.1﹣1×0.1= 12×3.14﹣6.28= ++= ×0.25+3=
直接写得数4.3+3.57= 6.3÷0.9= 2.4×0.5= 1÷0.2÷0.5=5﹣﹣= 10÷10%= 1÷0.2÷0.5= 7×÷7×=
直接写得数24÷= ﹣= 10+2.52= (﹣0.5)×=×= (+)×12= ×÷×= 0.32×200=
计算下面各题.= = = =+= = = ==
口算:= = = = == = =