一块长方形水稻田，宽是50米，长比宽的2倍少20米，这块水稻地的面积是多少平方米？
用分数表示下面各个算式的商．4÷5=，7÷5=，5÷7=，4÷3=
直接写出得数．1÷0.25= +1= ×24=+= ﹣= 470×0.02=10÷= 6×0= 3×﹣×3=
直接写出得数．= = = == = = =
直接写出得数：36+79= 15÷1%= 9.1﹣1.9= 7.2÷0.6=0.25×8= ÷= ﹣= ×=1+30%= += 0.52= 9π=
直接写出得数 243+49= 198﹣79= 9.3+4.76= 20.67﹣8.7= 320×0.5= 12.5×=45÷0.15= = = = = =
+1
= 
×24=
+
= 
﹣
= 470×0.02=
= 6
×0= 3×
﹣
= 
= 
= 
=
= 
= 
= 
=
÷
= 
﹣
= 
×
=
+
= 0.52= 9π=
=
= 
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