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一、口算。
$1.15\times6=$ $4.9 + 5.5=$ $6.8\div0.04=$
$1.8 - 0.08=$ $8.4\div2.1=$ $1.25\times40=$
$96\div3.2=$ $1.7\times300=$ $4.8 - 0.52=$
$8\times0.25=$ $0.74 + 0.56=$ $7.2\div0.8=$
$0.95 - 0.5=$ $42\div0.07=$ $6.8 + 0.32=$
$\frac{2}{5}+\frac{7}{8}=$ $\frac{3}{4}+\frac{1}{7}=$ $\frac{5}{12}-\frac{1}{12}=$
$1-\frac{7}{45}=$ $27-\frac{2}{3}=$ $\frac{3}{10}+\frac{2}{5}=$
$\frac{7}{8}+\frac{5}{8}=$ $\frac{2}{21}+\frac{6}{7}=$ $\frac{4}{5}-\frac{3}{4}=$
$\frac{4}{15}+\frac{5}{9}=$ $\frac{17}{24}-\frac{3}{8}=$ $\frac{2}{5}+\frac{7}{15}=$
$\frac{5}{8}-\frac{1}{4}=$ $\frac{5}{8}+\frac{1}{3}=$ $\frac{9}{5}-\frac{3}{10}=$
$1.15\times6=$ $4.9 + 5.5=$ $6.8\div0.04=$
$1.8 - 0.08=$ $8.4\div2.1=$ $1.25\times40=$
$96\div3.2=$ $1.7\times300=$ $4.8 - 0.52=$
$8\times0.25=$ $0.74 + 0.56=$ $7.2\div0.8=$
$0.95 - 0.5=$ $42\div0.07=$ $6.8 + 0.32=$
$\frac{2}{5}+\frac{7}{8}=$ $\frac{3}{4}+\frac{1}{7}=$ $\frac{5}{12}-\frac{1}{12}=$
$1-\frac{7}{45}=$ $27-\frac{2}{3}=$ $\frac{3}{10}+\frac{2}{5}=$
$\frac{7}{8}+\frac{5}{8}=$ $\frac{2}{21}+\frac{6}{7}=$ $\frac{4}{5}-\frac{3}{4}=$
$\frac{4}{15}+\frac{5}{9}=$ $\frac{17}{24}-\frac{3}{8}=$ $\frac{2}{5}+\frac{7}{15}=$
$\frac{5}{8}-\frac{1}{4}=$ $\frac{5}{8}+\frac{1}{3}=$ $\frac{9}{5}-\frac{3}{10}=$
答案
$6.9 10.4 1701.72 4 5030 510 4.282 1.3 90.45 600 7.12\frac{51}{40} \frac{25}{28} \frac{1}{3}\frac{38}{45} 26\frac{1}{3} \frac{7}{10}\frac{3}{2} \frac{20}{21} \frac{1}{20}\frac{37}{45} \frac{1}{3} \frac{13}{15}\frac{3}{8} \frac{23}{24} \frac{3}{2}$
