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一、口算。
$2.4÷12=$
$37.5×200=$
$0.7×0.9=$
$2.01-0.11=$
$9.6÷40=$
$0.12×0.3=$
$\frac {6}{7}+\frac {11}{14}=$
$\frac {7}{12}-\frac {1}{6}=$
$2.4÷12=$
0.2
$2.75×200=$550
$20.5+2.05=$22.55
$37.5×200=$
7500
$0.78+2.2=$2.98
$0.65×20=$13
$0.7×0.9=$
0.63
$2.5-1.05=$1.45
$6.3÷0.21=$30
$2.01-0.11=$
1.9
$0.16÷8=$0.02
$4.15+0.85=$5
$9.6÷40=$
0.24
$96÷0.24=$400
$0.48÷0.4=$1.2
$0.12×0.3=$
0.036
$2.73+0.37=$3.1
$6×0.95=$5.7
$\frac {6}{7}+\frac {11}{14}=$
$\frac{23}{14}$
$\frac {7}{6}-\frac {6}{7}=$$\frac{13}{42}$
$\frac {1}{2}+\frac {1}{3}=$$\frac{5}{6}$
$\frac {7}{12}-\frac {1}{6}=$
$\frac{5}{12}$
$\frac {2}{3}+\frac {2}{15}=$$\frac{4}{5}$
$\frac {7}{10}-\frac {2}{15}=$$\frac{17}{30}$
答案
一、0.2 550 22.55
7500 2.98 13
0.63 1.45 30
1.9 0.02 5
0.24 400 1.2
0.036 3.1 5.7
$\frac{23}{14}$ $\frac{13}{42}$ $\frac{5}{6}$
$\frac{5}{12}$ $\frac{4}{5}$ $\frac{17}{30}$
7500 2.98 13
0.63 1.45 30
1.9 0.02 5
0.24 400 1.2
0.036 3.1 5.7
$\frac{23}{14}$ $\frac{13}{42}$ $\frac{5}{6}$
$\frac{5}{12}$ $\frac{4}{5}$ $\frac{17}{30}$
二、计算长方体和正方体的体积。
答案
二、$8×8×8=512(cm^{3})$
$2×2×4.5=18(cm^{3})$
$2×2×4.5=18(cm^{3})$
