计算 25×2= 16×3= 20×30=300×200= 40×100= 50×200=
口算.3.2×0.2 1.4×0.4 3.3÷3 1.2÷0.3 5.6÷0.42.5×0.4 1.5×2 7.3+2.7 8.4÷0.7 4.5÷0.90.53﹣0.3 7.8÷6 8.4÷0.21 0.6×0.5 8.1×25.6+3.6 9﹣2.35 0.56÷8 1.23×3 12.5÷0.1.
竖式计算,得数保留两位小数.0.38×0.65 6.18×0.99 4.8÷2.3 23.5÷0.18.
用竖式计算. 3.49+2.15 7.4﹣3.68 5.3×0.26 0.453÷0.15.
直接写出得数.3.8÷0.19= 0.73×1.25×0.8= 1.6×2.5= 0.15×15﹣5×0.15=1÷0.2= 1.8×3.6+6.4×1.8= 2.5×0.3= 1.25×3.2×0.25=
计算:12×2.5= 7.5×0.4= 1÷0.625= 8.4÷4.2=24÷4+56÷4= 2.5+2.5×3= 0.25×8= 12.5÷2.5=