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一、口算。
$1 - 0.99=$ $9.6\div4=$ $0.72 - 0.5=$
$0.12\times7=$ $4.15 + 0.85=$ $3.2\times50=$
$1.7 + 3=$ $4.8 - 0.36=$ $0.16\div8=$
$0.56\div0.8=$ $0.08\times600=$ $2.63 - 0.88=$
$2.48\times0.3=$ $1.6 - 0.15=$ $3.8 + 0.03=$
$\frac{3}{4}+\frac{2}{9}=$ $\frac{7}{4}-\frac{2}{3}=$ $1-\frac{1}{99}=$
$\frac{3}{7}-\frac{1}{6}=$ $\frac{4}{21}+\frac{5}{7}=$ $\frac{1}{10}+\frac{2}{5}=$
$\frac{2}{9}+\frac{3}{8}=$ $\frac{2}{5}-\frac{1}{3}=$ $\frac{5}{8}-\frac{7}{16}=$
$\frac{4}{5}-\frac{7}{15}=$ $\frac{8}{15}+\frac{2}{3}=$ $\frac{3}{14}+\frac{3}{7}=$
$\frac{2}{9}+\frac{1}{2}=$ $\frac{3}{4}-\frac{1}{8}=$ $\frac{10}{9}-\frac{3}{5}=$
$1 - 0.99=$ $9.6\div4=$ $0.72 - 0.5=$
$0.12\times7=$ $4.15 + 0.85=$ $3.2\times50=$
$1.7 + 3=$ $4.8 - 0.36=$ $0.16\div8=$
$0.56\div0.8=$ $0.08\times600=$ $2.63 - 0.88=$
$2.48\times0.3=$ $1.6 - 0.15=$ $3.8 + 0.03=$
$\frac{3}{4}+\frac{2}{9}=$ $\frac{7}{4}-\frac{2}{3}=$ $1-\frac{1}{99}=$
$\frac{3}{7}-\frac{1}{6}=$ $\frac{4}{21}+\frac{5}{7}=$ $\frac{1}{10}+\frac{2}{5}=$
$\frac{2}{9}+\frac{3}{8}=$ $\frac{2}{5}-\frac{1}{3}=$ $\frac{5}{8}-\frac{7}{16}=$
$\frac{4}{5}-\frac{7}{15}=$ $\frac{8}{15}+\frac{2}{3}=$ $\frac{3}{14}+\frac{3}{7}=$
$\frac{2}{9}+\frac{1}{2}=$ $\frac{3}{4}-\frac{1}{8}=$ $\frac{10}{9}-\frac{3}{5}=$
答案
$0.01 2.4 0.220.84 5 1604.7 4.44 0.020.7 48 1.750.744 1.45 3.83\frac{35}{36} \frac{13}{12} \frac{98}{99}\frac{11}{42} \frac{19}{21} \frac{1}{2}\frac{43}{72} \frac{1}{15} \frac{3}{16}\frac{1}{3} \frac{6}{5} \frac{9}{14}\frac{13}{18} \frac{5}{8} \frac{23}{45}$
二、解方程。
$2.3 + 4x = 8.3$ $0.5x - 1.4\times5 = 3.6$ $5x + 2.2x = 72$
$2.3 + 4x = 8.3$ $0.5x - 1.4\times5 = 3.6$ $5x + 2.2x = 72$
答案
x = 1.5
x = 21.2
x = 10
x = 21.2
x = 10
