Question

13£®¼ÆËãÏÂÃæ¸÷Ì⣬ÄܼòËãµÄÒª¼òË㣮
$\frac{8}{13}$¡Â7+$\frac{1}{7}$¡Á$\frac{6}{13}$
$\frac{1}{2}$¡Á$\frac{2}{5}$+$\frac{9}{10}$¡Â$\frac{9}{20}$
£¨$\frac{1}{2}$+$\frac{2}{3}$+$\frac{3}{4}$£©¡Á24
$\frac{3}{5}$¡Â0.8¡Â$\frac{1}{12}$£®

Answer 1

·ÖÎö £¨1£©£¨3£©ÔËÓó˷¨·ÖÅäÂɼòË㣻
£¨2£©ÏÈËã³Ë³ý£¬ÔÙËã¼Ó·¨£»
£¨4£©°ÑСÊý±äΪ·ÖÊý£¬°Ñ³ý·¨±äΪ³Ë·¨£¬ÔÙ¼ÆË㣮

½â´ð ½â£º£¨1£©$\frac{8}{13}$¡Â7+$\frac{1}{7}$¡Á$\frac{6}{13}$
=$\frac{8}{13}$¡Á$\frac{1}{7}$+$\frac{1}{7}$¡Á$\frac{6}{13}$
=£¨$\frac{8}{13}$+$\frac{6}{13}$£©¡Á$\frac{1}{7}$
=$\frac{14}{13}$¡Á$\frac{1}{7}$
=$\frac{2}{13}$

£¨2£©$\frac{1}{2}$¡Á$\frac{2}{5}$+$\frac{9}{10}$¡Â$\frac{9}{20}$
=$\frac{1}{5}$+$\frac{9}{10}$¡Á$\frac{20}{9}$
=$\frac{1}{5}$+2
=2$\frac{1}{5}$

£¨3£©£¨$\frac{1}{2}$+$\frac{2}{3}$+$\frac{3}{4}$£©¡Á24
=$\frac{1}{2}$¡Á24+$\frac{2}{3}$¡Á24+$\frac{3}{4}$¡Á24
=12+16+18
=46

£¨4£©$\frac{3}{5}$¡Â0.8¡Â$\frac{1}{12}$
=$\frac{3}{5}$¡Â$\frac{4}{5}$¡Â$\frac{1}{12}$
=$\frac{3}{5}$¡Á$\frac{5}{4}$¡Á12
=9

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