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一、口算。
$0.7×4.5=$
$21.9÷0.03=$
$\dfrac{5}{8}×\dfrac{3}{65}=$
$8.6×5=$
$\dfrac{5}{6}÷\dfrac{2}{5}=$
$1-15\%=$
$\dfrac{7}{11}÷\dfrac{11}{14}=$
$0.7×4.5=$
3.15
$0.48+3.72=$4.2
$3.7-2.7÷3=$2.8
$21.9÷0.03=$
730
$\dfrac{5}{6}-\dfrac{2}{3}=$$\dfrac{1}{6}$
$48÷12×2.5=$10
$\dfrac{5}{8}×\dfrac{3}{65}=$
$\dfrac{3}{104}$
$\dfrac{7}{11}+\dfrac{5}{22}=$$\dfrac{19}{22}$
$(0.18+0.9)÷9=$0.12
$8.6×5=$
43
$34÷\dfrac{85}{7}=$$\dfrac{14}{5}$
$65÷2.5÷0.4=$65
$\dfrac{5}{6}÷\dfrac{2}{5}=$
$\dfrac{25}{12}$
$2100÷400=$5.25
$18÷\dfrac{3}{5}×\dfrac{1}{3}=$10
$1-15\%=$
0.85
$\dfrac{8}{5}×37.5\%=$$\dfrac{3}{5}$
$3.7+2.61+6.3=$12.61
$\dfrac{7}{11}÷\dfrac{11}{14}=$
$\dfrac{98}{121}$
$\dfrac{2}{5}-\dfrac{1}{12}=$$\dfrac{19}{60}$
$8.8×99+8.8=$880
答案
一、3.15 4.2 2.8
730 $\dfrac{1}{6}$ 10
$\dfrac{3}{104}$ $\dfrac{19}{22}$ 0.12
43 $\dfrac{14}{5}$ 65
$\dfrac{25}{12}$ 5.25 10
0.85 $\dfrac{3}{5}$ 12.61
$\dfrac{98}{121}$ $\dfrac{19}{60}$ 880
730 $\dfrac{1}{6}$ 10
$\dfrac{3}{104}$ $\dfrac{19}{22}$ 0.12
43 $\dfrac{14}{5}$ 65
$\dfrac{25}{12}$ 5.25 10
0.85 $\dfrac{3}{5}$ 12.61
$\dfrac{98}{121}$ $\dfrac{19}{60}$ 880
二、计算下面各图中涂色部分的面积。
答案
二、3.14×6²÷4 - 3.14×(6÷2)²÷2 = 14.13(cm²)
6×(6 + 3)÷2 - 6×6÷2 = 9(cm²)
6×(6 + 3)÷2 - 6×6÷2 = 9(cm²)
