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一、口算。
$3.5×0.2=$ $8.4÷0.3=$ $1.7÷10×0.2=$
$4.86÷0.6=$ $12.7 - 7.7=$ $1 - 0.01 + 0.99=$
$0.35 + 0.45=$ $0.05×80=$ $1.5×4 + 1.5=$
$2.8÷0.07=$ $4.06 - 3.5=$ $3.5÷2.5÷0.2=$
$9×0.39=$ $20.4÷60=$ $(0.5 + 0.6)×9=$
$\frac{7}{6}-\frac{3}{5}=$ $\frac{7}{3}+\frac{7}{10}=$ $1-\frac{4}{9}+\frac{5}{9}=$
$\frac{3}{8}+\frac{8}{5}=$ $\frac{9}{10}-\frac{2}{3}=$ $4-\frac{7}{8}-\frac{1}{8}=$
$\frac{7}{3}-\frac{2}{5}=$ $\frac{4}{15}+\frac{11}{18}=$ $\frac{3}{8}+\frac{5}{6}+\frac{1}{6}=$
$\frac{4}{9}+\frac{5}{12}=$ $\frac{19}{24}-\frac{5}{36}=$ $3+\frac{3}{4}+\frac{1}{4}=$
$\frac{2}{3}-\frac{1}{4}=$ $\frac{7}{12}+\frac{5}{18}=$ $1-\frac{7}{13}-\frac{6}{13}=$
$3.5×0.2=$ $8.4÷0.3=$ $1.7÷10×0.2=$
$4.86÷0.6=$ $12.7 - 7.7=$ $1 - 0.01 + 0.99=$
$0.35 + 0.45=$ $0.05×80=$ $1.5×4 + 1.5=$
$2.8÷0.07=$ $4.06 - 3.5=$ $3.5÷2.5÷0.2=$
$9×0.39=$ $20.4÷60=$ $(0.5 + 0.6)×9=$
$\frac{7}{6}-\frac{3}{5}=$ $\frac{7}{3}+\frac{7}{10}=$ $1-\frac{4}{9}+\frac{5}{9}=$
$\frac{3}{8}+\frac{8}{5}=$ $\frac{9}{10}-\frac{2}{3}=$ $4-\frac{7}{8}-\frac{1}{8}=$
$\frac{7}{3}-\frac{2}{5}=$ $\frac{4}{15}+\frac{11}{18}=$ $\frac{3}{8}+\frac{5}{6}+\frac{1}{6}=$
$\frac{4}{9}+\frac{5}{12}=$ $\frac{19}{24}-\frac{5}{36}=$ $3+\frac{3}{4}+\frac{1}{4}=$
$\frac{2}{3}-\frac{1}{4}=$ $\frac{7}{12}+\frac{5}{18}=$ $1-\frac{7}{13}-\frac{6}{13}=$
答案
$0.7 28 0.0348.1 5 1.980.8 4 7.540 0.56 73.51 0.34 9.9\frac{17}{30} \frac{91}{30} \frac{10}{9}\frac{79}{40} \frac{7}{30} 3\frac{29}{15} \frac{79}{90} 1\frac{3}{8}\frac{31}{36} \frac{47}{72} 4\frac{5}{12} \frac{31}{36} 0$
二、计算下面各题，怎样简便就怎样计算。
$930 - 7.94×99 - 7.94$ $4.83÷15 + 0.45×18$ $17.5-(10.75 - 2.35)÷4$
$930 - 7.94×99 - 7.94$ $4.83÷15 + 0.45×18$ $17.5-(10.75 - 2.35)÷4$
答案
136 8.422 15.4
