为了纪念人民解放战争的胜利，张老师向同学们推荐观看有关解放战争题材的电影如（    ）

①七七事变 ②《挺进大别山》③《西安事变》④《辽沈战役》

$\frac{5}{9}$ - $\frac{1}{8}$ =          $\frac{1}{3}$ + $\frac{2}{3}$ =          0.25+ $\frac{7}{4}$ =        $1\frac{1}{2}$ - $\frac{3}{8}$ - $\frac{5}{8}$ =

$\frac{4}{3}$ + $\frac{1}{2}$ =          1- $\frac{3}{5}$ =           0.875- $\frac{1}{2}$ =       $4\frac{3}{7}$ - $\frac{3}{7}$ + $\frac{1}{8}$ =

$\frac{1}{7}$ + $\frac{1}{6}$ =          $\frac{1}{2}$ - $\frac{1}{5}$ =         $\frac{5}{6}$ - $\frac{2}{9}$ =           $\frac{1}{2}$ + $1\frac{1}{5}$ =

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