Question

6£®¼ÆËãÏÂÃæ¸÷Ì⣨ÄܼòËãµÄÒªÓüò±ã·½·¨¼ÆË㣩
$\frac{5}{7}$¡Á21¡Á$\frac{3}{10}$
$\frac{4}{9}$¡Â5¡Á$\frac{5}{6}$
$\frac{7}{8}$¡Â$\frac{3}{4}$¡Â$\frac{7}{12}$
$\frac{1}{14}$¡Á£¨$\frac{7}{8}$+7£©
$\frac{5}{6}$¡Á$\frac{1}{4}$+$\frac{5}{6}$¡Á$\frac{3}{4}$£®

Answer 1

·ÖÎö £¨1£©´Ó×óÍùÓÒÒÀ´Î¼ÆË㣻
£¨2£©£¨3£©°Ñ³ý·¨±äΪ³Ë·¨£¬Ô¼·Ö¼ÆË㣻
£¨4£©£¨5£©ÔËÓó˷¨·ÖÅäÂɼòË㣮

½â´ð ½â£º£¨1£©$\frac{5}{7}$¡Á21¡Á$\frac{3}{10}$
=15¡Á$\frac{3}{10}$
=$\frac{9}{2}$

£¨2£©$\frac{4}{9}$¡Â5¡Á$\frac{5}{6}$
=$\frac{4}{9}$¡Á$\frac{1}{5}$¡Á$\frac{5}{6}$
=$\frac{2}{27}$

£¨3£©$\frac{7}{8}$¡Â$\frac{3}{4}$¡Â$\frac{7}{12}$
=$\frac{7}{8}$¡Á$\frac{4}{3}$¡Á$\frac{12}{7}$
=2

£¨4£©$\frac{1}{14}$¡Á£¨$\frac{7}{8}$+7£©
=$\frac{1}{14}$¡Á$\frac{7}{8}$+7¡Á$\frac{1}{14}$
=$\frac{1}{16}$+$\frac{1}{2}$
=$\frac{9}{16}$

£¨5£©$\frac{5}{6}$¡Á$\frac{1}{4}$+$\frac{5}{6}$¡Á$\frac{3}{4}$
=$\frac{5}{6}$¡Á£¨$\frac{1}{4}$+$\frac{3}{4}$£©
=$\frac{5}{6}$¡Á1
=$\frac{5}{6}$

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