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一、口算。
$3.2÷0.04=$
$0.125×8 =$
$1.9 + 4.01 =$
$4÷0.25 =$
$1.2×0.8 =$
$4.2×3 =$
$\frac{1}{2} + \frac{4}{11} =$
$\frac{4}{5} - \frac{1}{2} =$
$3.2÷0.04=$
80
$4.08 + 5.2 =$9.28
$2.05÷100 =$0.0205
$0.125×8 =$
1
$1.8×40 =$72
$1.2×6 =$7.2
$1.9 + 4.01 =$
5.91
$8.8÷0.11 =$80
$1 + 3.89 =$4.89
$4÷0.25 =$
16
$3.2×0.5 =$1.6
$9.6÷0.32 =$30
$1.2×0.8 =$
0.96
$3.6 - 0.36 =$3.24
$100 - 35.22 =$64.78
$4.2×3 =$
12.6
$70÷3.5 =$20
$3.5×0.01 =$0.035
$\frac{1}{2} + \frac{4}{11} =$
$\frac{19}{22}$
$\frac{9}{10} - \frac{3}{8} =$$\frac{21}{40}$
$\frac{9}{4} + \frac{3}{4} =$3
$\frac{4}{5} - \frac{1}{2} =$
$\frac{3}{10}$
$\frac{9}{20} + \frac{2}{5} =$$\frac{17}{20}$
$1 - \frac{4}{5} =$$\frac{1}{5}$
答案
一、80 9.28 0.0205
1 72 7.2
5.91 80 4.89
16 1.6 30
0.96 3.24 64.78
12.6 20 0.035
$\frac{19}{22}$ $\frac{21}{40}$ 3
$\frac{3}{10}$ $\frac{17}{20}$ $\frac{1}{5}$
1 72 7.2
5.91 80 4.89
16 1.6 30
0.96 3.24 64.78
12.6 20 0.035
$\frac{19}{22}$ $\frac{21}{40}$ 3
$\frac{3}{10}$ $\frac{17}{20}$ $\frac{1}{5}$
二、计算长方体和正方体的表面积。
(6×5+6×3.5+5×3.5)×2=137(cm²)
6×6×6=216(cm²)
(6×5+6×3.5+5×3.5)×2=137(cm²)
6×6×6=216(cm²)
答案
二、(6×5+6×3.5+5×3.5)×2=137(cm²)
6×6×6=216(cm²)
6×6×6=216(cm²)
