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一、口算。
$1.6÷0.04=$
$3.9÷1.3=$
$0.04×0.3=$
$50÷0.5=$
$0.6×8=$
$4×1.65=$
$\frac {3}{4}+\frac {1}{6}=$
$\frac {1}{3}-\frac {1}{4}=$
$1.6÷0.04=$
40
$1.8×5=$9
$0.9×7+10.7=$17
$3.9÷1.3=$
3
$0.8×5.2=$4.16
$2.5×0.9×4=$9
$0.04×0.3=$
0.012
$0.9+1.4=$2.3
$(1.6+2.4)÷5=$0.8
$50÷0.5=$
100
$4.8+5.2=$10
$0.6÷0.3+0.5=$2.5
$0.6×8=$
4.8
$10÷0.25=$40
$(1-0.1)×0.1=$0.09
$4×1.65=$
6.6
$1.23+0.87=$2.1
$1.8÷0.9×0.5=$1
$\frac {3}{4}+\frac {1}{6}=$
$\frac{11}{12}$
$\frac {5}{8}-\frac {7}{12}=$$\frac{1}{24}$
$\frac {3}{2}-(\frac {7}{8}-\frac {1}{2})=$$\frac{9}{8}$
$\frac {1}{3}-\frac {1}{4}=$
$\frac{1}{12}$
$\frac {1}{3}+\frac {5}{12}=$$\frac{3}{4}$
$\frac {4}{5}+\frac {2}{7}+\frac {1}{5}=$$\frac{9}{7}$
答案
一、40 9 17
3 4.16 9
0.012 2.3 0.8
100 10 2.5
4.8 40 0.09
6.6 2.1 1
$\frac{11}{12}$ $\frac{1}{24}$ $\frac{9}{8}$
$\frac{1}{12}$ $\frac{3}{4}$ $\frac{9}{7}$
3 4.16 9
0.012 2.3 0.8
100 10 2.5
4.8 40 0.09
6.6 2.1 1
$\frac{11}{12}$ $\frac{1}{24}$ $\frac{9}{8}$
$\frac{1}{12}$ $\frac{3}{4}$ $\frac{9}{7}$
二、计算下面各图形的表面积。
6×6×6+2×2×4=232(cm²)
4×4×6−(4−2)×(4−2)×2=88(cm²)
6×6×6+2×2×4=232(cm²)
4×4×6−(4−2)×(4−2)×2=88(cm²)
答案
二、6×6×6+2×2×4=232(cm²)
4×4×6−(4−2)×(4−2)×2=88(cm²)
4×4×6−(4−2)×(4−2)×2=88(cm²)
