Question

14£®ÔÚºáÏòÀïÌîÉϺÏÊʵÄÔËËã·ûºÅ£®
$\frac{5}{12}$+$\frac{1}{6}$=$\frac{1}{4}$
$\frac{7}{8}$-$\frac{1}{12}$=$\frac{19}{24}$
1-$\frac{2}{7}$-$\frac{4}{7}$=$\frac{1}{7}$
$\frac{4}{9}$+$\frac{2}{7}$+$\frac{5}{9}$=$\frac{9}{7}$£®

Answer 1

·ÖÎö £¨1£©£¨2£©ÏÈͨ·ÖºóÔٹ۲켴¿É£»
£¨3£©¹Û²ì¿ÉµÃ$\frac{1}{7}+\frac{2}{7}+\frac{4}{7}$=1£¬¾Ý´Ë½â´ð¼´¿É£»
£¨4£©ÒòΪ$\frac{4}{9}+\frac{5}{9}$+$\frac{2}{7}$=$\frac{9}{7}$£¬ËùÒԿɵÃ$\frac{4}{9}$+$\frac{2}{7}$+$\frac{5}{9}$=$\frac{9}{7}$£®

½â´ð ½â£º£¨1£©$\frac{1}{6}$=$\frac{2}{12}$£¬$\frac{1}{4}$=$\frac{3}{12}$£¬
ÒòΪ$\frac{2}{12}+\frac{3}{12}=\frac{5}{12}$£¬
ËùÒÔ$\frac{5}{12}$-$\frac{1}{6}$=$\frac{1}{4}$£»
£¨2£©$\frac{7}{8}=\frac{21}{24}$£¬$\frac{1}{12}=\frac{2}{24}$£¬
ÒòΪ$\frac{2}{24}+\frac{19}{24}=\frac{21}{24}$£¬
ËùÒÔ$\frac{7}{8}$-$\frac{1}{12}$=$\frac{19}{24}$£»
£¨3£©ÒòΪ$\frac{1}{7}+\frac{2}{7}+\frac{4}{7}$=1£¬
ËùÒÔ1-$\frac{2}{7}$-$\frac{4}{7}$=$\frac{1}{7}$£»
£¨4£©ÒòΪ$\frac{4}{9}+\frac{5}{9}$+$\frac{2}{7}$=$\frac{9}{7}$£¬
ËùÒÔ$\frac{4}{9}$+$\frac{2}{7}$+$\frac{5}{9}$=$\frac{9}{7}$£®
¹Ê´ð°¸Îª£º£¨1£©+£»£¨2£©-£»£¨3£©-£¬-£»£¨4£©+£¬+£®

µãÆÀ ±¾Ì⿼²é½â´ð´ËÌ⣬ӦעÒâÌâÄ¿ÖеÄÊý×ÖÌص㣬´ÓÕûÌåÉϽøÐп¼ÂÇ£®