Question

15£®¼ÆËãÏÂÁи÷Ì⣬ÔõÑù¼òËã¾ÍÔõÑù¼ÆË㣮

$\frac{5}{6}$¡Á$\frac{7}{8}$+$\frac{5}{6}$¡Á$\frac{1}{8}$	56¡Á£¨21¡Á$\frac{7}{8}$£©	99¡Á$\frac{7}{10}$
$\frac{6}{13}$¡Á$\frac{5}{12}$+$\frac{7}{12}$¡Á$\frac{5}{13}$	$\frac{3}{7}$¡Â$\frac{4}{5}$+$\frac{4}{7}$¡Á$\frac{5}{4}$	101¡Á$\frac{1}{5}$-$\frac{1}{5}$£®

Answer 1

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¢ÚÈ¥À¨ºÅ£¬ÔÙÀûÓó˷¨µÄ½»»»ÂɽáºÏÂɼÆË㣻
¢Û°Ñ99д³É£¨100-1£©£¬ÔÙ¸ù¾Ý³Ë·¨·ÖÅäÂɼÆË㣻
¢Ü¸ù¾Ý³Ë·¨µÄÐÔÖÊ£¬ÏÈ°Ñ$\frac{6}{13}$¡Á$\frac{5}{12}$+$\frac{7}{12}$¡Á$\frac{5}{13}$£¬±äΪ$\frac{5}{13}$¡Á$\frac{6}{12}$+$\frac{7}{12}$¡Á$\frac{5}{13}$£¬ÔÙ¸ù¾Ý³Ë·¨µÄ·ÖÅäÂɼÆË㣻
¢ÝÏȰѳý·¨±ä³Ë·¨£¬ÔÙ¸ù¾Ý³Ë·¨·ÖÅäÂɼÆË㣻
¢Þ¸ù¾Ý³Ë·¨·ÖÅäÂɼÆË㣮

½â´ð ½â£º¢Ù$\frac{5}{6}$¡Á$\frac{7}{8}$+$\frac{5}{6}$¡Á$\frac{1}{8}$
=$\frac{5}{6}$£¨$\frac{7}{8}$+$\frac{1}{8}$£©
=$\frac{5}{6}$

¢Ú56¡Á£¨21¡Á$\frac{7}{8}$£©
=56¡Á$\frac{7}{8}$¡Á21
=49¡Á21
=1029

¢Û99¡Á$\frac{7}{10}$
=£¨100-1£©¡Á$\frac{7}{10}$
=70-$\frac{7}{10}$
=69$\frac{3}{10}$

¢Ü$\frac{6}{13}$¡Á$\frac{5}{12}$+$\frac{7}{12}$¡Á$\frac{5}{13}$
=$\frac{5}{13}$¡Á$\frac{6}{12}$+$\frac{7}{12}$¡Á$\frac{5}{13}$
=$\frac{5}{13}$¡Á£¨$\frac{6}{12}+\frac{7}{12}$£©
=$\frac{5}{13}$¡Á$\frac{13}{12}$
=$\frac{5}{12}$

¢Ý$\frac{3}{7}$¡Â$\frac{4}{5}$+$\frac{4}{7}$¡Á$\frac{5}{4}$
=$\frac{3}{7}$¡Á$\frac{5}{4}$+$\frac{4}{7}$¡Á$\frac{5}{4}$
=$\frac{5}{4}$¡Á£¨$\frac{3}{7}+\frac{4}{7}$£©
=$\frac{5}{4}$

¢Þ101¡Á$\frac{1}{5}$-$\frac{1}{5}$
=$\frac{1}{5}$¡Á£¨101-1£©
=$\frac{1}{5}$¡Á100
=20

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