为民旅社有床位840张,比扩建前增加了20%,扩建前比扩建后少多少张床位?
直接写出得数.5.1﹣2= 7.2÷1.2= 3.9×0.01= 98.4÷100=2.5×4= 2.6k﹣1.8k= 13b+2.7b= 0.34+0.45=
计算下面各题,并且验算.73.3﹣4.46 27.8×1.02354.36+47.7 0.24÷1.65060﹣485 12.48÷1.6.
口算题0.25×4= 4÷0.01= 3.5+7.5= (2.5﹣0.25)×4=0.96÷0.3= 7.3×0.01= 7.2÷0.12= 12.5×0.7×0.8=
直接写得数:8.6+2.4= 0.35÷0.7= 0.5×0.2= 1.25×8= 0.36×100=1﹣0.09﹣0.9= 2.8+3.2= 0÷8×0.25= 12.3﹣2.3=
口算. 8.5+1.3= 15.7﹣0.4= 3.8×2= 2.6×0.2= 6.9÷3=1÷0.4= 42÷84= 4﹣0.17= 0.8×1.25= 7.3÷0.01=