一、口算。
$\frac{16}{9}-\frac{8}{9}=$ $\frac{23}{50}+\frac{2}{50}=$ $\frac{7}{18}-\frac{6}{18}=$
$\frac{2}{7}+\frac{4}{7}=$ $\frac{52}{78}-\frac{25}{78}=$ $\frac{12}{15}+\frac{8}{15}=$
$\frac{5}{14}-\frac{3}{14}=$ $\frac{13}{36}+\frac{7}{36}=$ $\frac{17}{21}-\frac{11}{21}=$
$207\div9=$ $3.2\times0.3=$ $0.75\div2.5=$
$1.8\times70=$ $21\div0.7=$ $2.7 + 0.33=$
$750\div1.5=$ $16 - 0.16=$ $0.24\times0.8=$
$1.5\times9=$ $3.65 + 0.35=$ $0.039\div0.13=$
$6.7 + 23=$ $200\times0.85=$ $8.4 - 0.84=$
$3.11 - 1.96=$ $2.4\div0.8=$ $0.16\times5=$
$316 + 684=$ $2.7\times0.9=$ $0.36 - 0.28=$

一、$\frac{8}{9}$ $\frac{25}{50}$ $\frac{1}{18}$
$\frac{6}{7}$ $\frac{27}{78}$ $\frac{20}{15}$
$\frac{2}{14}$ $\frac{20}{36}$ $\frac{6}{21}$
23 0.96 0.3
126 30 3.03
500 15.84 0.192
13.5 4 0.3
29.7 170 7.56
1.15 3 0.8
1000 2.43 0.08

二、在〇里填“＞”“＜”或“=”。
$0.75〇\frac{7}{12}$ $0.625〇\frac{2}{3}$ $\frac{6}{5}〇1.2$
$\frac{9}{10}〇0.875$ $\frac{1}{3}〇0.3$ $\frac{3}{8}〇0.4$
$\frac{9}{4}〇2.25$ $\frac{7}{20}〇0.5$ $0.6〇\frac{3}{5}$

二、＞ ＜ =
＞ ＞ ＜
= ＜ =