Question

8£®ÏÂÃæ¸÷ÌâÔõÑùËã¼ò±ã¾ÍÔõÑùËã
$\frac{2}{5}$¡Â$\frac{1}{5}$¡Â$\frac{8}{9}$
$\frac{1}{7}$+$\frac{7}{8}$¡Á$\frac{5}{7}$+$\frac{3}{8}$
£¨$\frac{2}{3}$-$\frac{1}{5}$£©¡Á$\frac{15}{2}$
$\frac{5}{6}$¡Â$\frac{7}{9}$¡Á$\frac{1}{18}$£®

Answer 1

·ÖÎö ¢Ù$\frac{2}{5}$¡Â$\frac{1}{5}$¡Â$\frac{8}{9}$£¬°´ÕÕ´Ó×óµ½ÓÒµÄ˳Ðò¼ÆË㣻
¢Ú$\frac{1}{7}$+$\frac{7}{8}$¡Á$\frac{5}{7}$+$\frac{3}{8}$£¬ÏÈËã³Ë·¨£¬ÔÙÔËÓüӷ¨½áºÏÂɼòË㣻
¢Û£¨$\frac{2}{3}$-$\frac{1}{5}$£©¡Á$\frac{15}{2}$£¬ÔËÓó˷¨·ÖÅäÂɼòË㣻
¢Ü$\frac{5}{6}$¡Â$\frac{7}{9}$¡Á$\frac{1}{18}$£¬ÏÈËã³ý·¨£¬ÔÙËã³Ë·¨£®

½â´ð ½â£º¢Ù$\frac{2}{5}$¡Â$\frac{1}{5}$¡Â$\frac{8}{9}$
=$\frac{2}{5}¡Á5¡Á\frac{9}{8}$
=$\frac{9}{4}$£»

¢Ú$\frac{1}{7}$+$\frac{7}{8}$¡Á$\frac{5}{7}$+$\frac{3}{8}$
=$\frac{1}{7}+£¨\frac{5}{8}+\frac{3}{8}£©$
=$\frac{1}{7}+1$
=1$\frac{1}{7}$£»

¢Û£¨$\frac{2}{3}$-$\frac{1}{5}$£©¡Á$\frac{15}{2}$
=$\frac{2}{3}¡Á\frac{15}{2}-\frac{1}{5}¡Á\frac{15}{2}$
=$5-\frac{3}{2}$
=3$\frac{1}{2}$£»

¢Ü$\frac{5}{6}$¡Â$\frac{7}{9}$¡Á$\frac{1}{18}$
=$\frac{5}{6}¡Á\frac{9}{7}¡Á\frac{1}{18}$
=$\frac{5}{84}$£®

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