一个圆形观赏鱼池,周长是251.2米,这个鱼池的占地面积是多少平方米?
直接写得数 8.6+4= 0.35÷0.7= 6.5×0.2= 0.7×0.9= 7.2+2.8=0.96÷0.03= 12×2.5= 8.4÷4.2= 1.4×5= 1.68÷0.3=3.1×0.03= 27+456+73= 1÷0.25= 7.2×0.3= 0.99+1.8=1.2÷3= 2.3+1.9= 7.6÷4= 0.3×0.02= 2.87÷0.7=
直接写得数. 0.99+1.8= 1.5×0.4= 0÷4.86= 0.84÷2=2.5﹣0.05= 0.72÷0.9= 2.4÷0.06= 0.8×1.25=0.3×0.3= 10×0.07= 0.05×7= 0.2×0.26=
直接写出得数.5.43+1.07= 3.05×0.4= 0.46÷4.6= 3.7﹣2.9= 0.8×1.25=0.27÷3= 70÷0.5= 0.25×0.4= 1.7+0.43+3.3= 9.8﹣2.6﹣2.4=
5.79+2.63+4.21= 0.25×12= 1.2÷4= 10﹣0.18﹣0.12= 0.54×101=6.5﹣5= 0.54÷0.6= 0.02×0.5= 0.15+0.5= 0.25×4÷0.25×4=
口算:6.3+7= 4.8÷0.08= 9+0.1= 3﹣0.67﹣0.33=0.08÷0.2= 0.2×0.4= 1÷0.05= 0+2÷5=0.081×100= 7.96×10= 40万﹣13万= 0.45+3.5+.055=1﹣0.1= 0.31+0.3= 0.72÷1.2= 0.05×1=