怎样算简便就怎样算.4×28+56×28 (125﹣70)×8 28×4×532×125 47×99+47 719×85﹣719×75.
直接写得数 2.45×5= 5.4×0.5= 4.3+6.8= 10÷0.1=2.4+7.6÷4= 0.1﹣0.01= (1﹣0.98)×50= 5×0.75﹣0.75=
直接写数对又快.3.5×4= 8.2+2.08= 36÷0.01= 99+1÷10=6﹣2.4×2= 4÷0.5= 2÷25= 0.25×0.4=0.46÷4.6= 0.27÷0.3×0.3= 6.9﹣6.9×0= 7.5×2.5×4=4.3×101﹣4.3= 1÷0.1﹣9×0.1= 37.2×99+37.2= 7.1﹣0.6﹣0.4=
用竖式计算:3.46×5.8 0.521÷37(保留两位小数)
口算 0.16×5= 0.7÷0.01= 6.6÷0.66= 0.25×4=1×0.1= 1.3×0.2= 4÷0.8= 5.1÷1.7=
竖式计算 2.4×1.8= 0.73×2.4= 8.68÷3.1= 0.391÷0.17= 4.37÷0.05=