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一、口算。
$0.45 + 0.6 =$
$1.5×0.3 =$
$25×3.3×4 =$
$0.48÷0.8 =$
$9.9÷0.9 =$
$0.5÷(4.2 - 1.7) =$
$6.5 - 4.7 =$
$0.17×0.4 =$
$0.9 + 0.9÷0.3 =$
$0.84÷4.2 =$
$0.07×0.3 =$
$20.85 - (3.7 + 1.85) =$
$0.64 - 0.36 =$
$3.5÷7 =$
$2 - 0.64 - 0.36 =$
$0.85×0.4 =$
$0.184 + 0.116 =$
$37.2×99 + 37.2 =$
$\frac{11}{15} - \frac{3}{5} =$
$\frac{1}{5} - \frac{1}{8} =$
$\frac{17}{18} - (\frac{1}{2} + \frac{1}{18}) =$
$\frac{5}{4} + \frac{3}{14} =$
$\frac{3}{5} + \frac{1}{6} =$
$\frac{1}{2} + \frac{1}{3} + \frac{1}{4} =$
$0.45 + 0.6 =$
1.05
$1.5×0.3 =$
0.45
$25×3.3×4 =$
330
$0.48÷0.8 =$
0.6
$9.9÷0.9 =$
11
$0.5÷(4.2 - 1.7) =$
0.2
$6.5 - 4.7 =$
1.8
$0.17×0.4 =$
0.068
$0.9 + 0.9÷0.3 =$
3.9
$0.84÷4.2 =$
0.2
$0.07×0.3 =$
0.021
$20.85 - (3.7 + 1.85) =$
15.3
$0.64 - 0.36 =$
0.28
$3.5÷7 =$
0.5
$2 - 0.64 - 0.36 =$
1
$0.85×0.4 =$
0.34
$0.184 + 0.116 =$
0.3
$37.2×99 + 37.2 =$
3720
$\frac{11}{15} - \frac{3}{5} =$
$\frac{2}{15}$
$\frac{1}{5} - \frac{1}{8} =$
$\frac{3}{40}$
$\frac{17}{18} - (\frac{1}{2} + \frac{1}{18}) =$
$\frac{7}{18}$
$\frac{5}{4} + \frac{3}{14} =$
$\frac{41}{28}$
$\frac{3}{5} + \frac{1}{6} =$
$\frac{23}{30}$
$\frac{1}{2} + \frac{1}{3} + \frac{1}{4} =$
$\frac{13}{12}$
答案
一、1.05 0.45 330
0.6 11 0.2
1.8 0.068 3.9
0.2 0.021 15.3
0.28 0.5 1
0.34 0.3 3720
$\frac{2}{15}$ $\frac{3}{40}$ $\frac{7}{18}$
$\frac{41}{28}$ $\frac{23}{30}$ $\frac{13}{12}$
0.6 11 0.2
1.8 0.068 3.9
0.2 0.021 15.3
0.28 0.5 1
0.34 0.3 3720
$\frac{2}{15}$ $\frac{3}{40}$ $\frac{7}{18}$
$\frac{41}{28}$ $\frac{23}{30}$ $\frac{13}{12}$
二、计算下面各图形的表面积和体积。
答案
二、表面积：(3×4.5+3×6+4.5×6)×2=117(cm²)
体积：3×4.5×6=81(cm³)
表面积：4×4×6=96(cm²)
体积：4×4×4−2×2×2=56(cm³)
体积：3×4.5×6=81(cm³)
表面积：4×4×6=96(cm²)
体积：4×4×4−2×2×2=56(cm³)
