用竖式进行计算.(带★号的要验算)38.7+1.2=26.04﹣18.9=★63﹣10.17=
竖式计算.3.84×7.5= 13.2÷2.4=
直接写得数:1.2×0.3= ; 0.54×0.9= ; 0.4×2.5= ; 0.92= ;0.36×0.1= ; 7÷3.5= ; 4.2÷3= ; 4×(1.5+0.25)= .
直接写得数:0.25×8= 5.6×99= 18.45÷9= 3×0.32= 0.64÷0.4= 2.7÷0.3=
口算.0.6×5= 1.3×2= 9.4﹣0.4=5.1÷0.3= 2÷0.02= 6.5+3.07=4.3×2= 2.1÷3= 5.07×10=
口算2.8×100= 0.08×100= 4×(4÷4)= 0.2+28=89÷1000= 7.05÷1000= (5﹣5)÷5= 0.2+2.8=