Question

10£®½â·½³Ì
2x-$\frac{1}{5}$=$\frac{4}{5}$£»   $\frac{1}{4}$x+$\frac{2}{4}$x=$\frac{7}{6}$£»   x¡Â$\frac{5}{7}$=$\frac{4}{5}$£»   $\frac{1}{2}$x-$\frac{1}{4}$=$\frac{3}{5}$£»   $\frac{6}{7}$x¡Â$\frac{9}{10}$=$\frac{10}{9}$£®

Answer 1

·ÖÎö £¨1£©¸ù¾ÝµÈʽµÄÐÔÖÊ£¬·½³ÌÁ½±ßͬʱ¼ÓÉÏ$\frac{1}{5}$Çó½â£»
£¨2£©ÏÈ»¯¼ò·½³Ì£¬ÔÙ¸ù¾ÝµÈʽµÄÐÔÖÊ£¬·½³ÌÁ½±ßͬʱ³ýÒÔ$\frac{3}{4}$Çó½â£»
£¨3£©¸ù¾ÝµÈʽµÄÐÔÖÊ£¬·½³ÌÁ½±ßͬʱ³ËÒÔ$\frac{5}{7}$Çó½â£»
£¨4£©¸ù¾ÝµÈʽµÄÐÔÖÊ£¬·½³ÌÁ½±ßͬʱ¼ÓÉÏ$\frac{1}{4}$£¬ÔÙÁ½±ßͬʱ³ýÒÔ$\frac{1}{2}$Çó½â£»
£¨5£©¸ù¾ÝµÈʽµÄÐÔÖÊ£¬·½³ÌÁ½±ßͬʱ³ËÒÔ$\frac{9}{10}$£¬ÔÙÁ½±ßͬʱ³ýÒÔ$\frac{6}{7}$Çó½â£®

½â´ð +½â£º£¨1£©2x-$\frac{1}{5}$=$\frac{4}{5}$
       2x-$\frac{1}{5}$+$\frac{1}{5}$=$\frac{4}{5}$+$\frac{1}{5}$
            2x=1
         2x¡Â2=1¡Â2
             x=$\frac{1}{2}$£»

£¨2£©$\frac{1}{4}$x+$\frac{2}{4}$x=$\frac{7}{6}$
        $\frac{3}{4}$x=$\frac{7}{6}$
    $\frac{3}{4}$x¡Â$\frac{3}{4}$=$\frac{7}{6}$¡Â$\frac{3}{4}$
         x=$\frac{14}{9}$£»

£¨3£©x¡Â$\frac{5}{7}$=$\frac{4}{5}$
  x¡Â$\frac{5}{7}$¡Á$\frac{5}{7}$=$\frac{4}{5}$¡Á$\frac{5}{7}$
        x=$\frac{4}{7}$£»

£¨4£©$\frac{1}{2}$x-$\frac{1}{4}$=$\frac{3}{5}$
  $\frac{1}{2}$x-$\frac{1}{4}$+$\frac{1}{4}$=$\frac{3}{5}$+$\frac{1}{4}$
       $\frac{1}{2}$x=$\frac{17}{20}$
    $\frac{1}{2}$x$¡Â\frac{1}{2}$=$\frac{17}{20}$$¡Â\frac{1}{2}$
        x=1.7£»

£¨5£©$\frac{6}{7}$x¡Â$\frac{9}{10}$=$\frac{10}{9}$
  $\frac{6}{7}$x¡Â$\frac{9}{10}$¡Á$\frac{9}{10}$=$\frac{10}{9}$¡Á$\frac{9}{10}$
          $\frac{6}{7}$x=1
       $\frac{6}{7}$x$¡Â\frac{6}{7}$=1$¡Â\frac{6}{7}$
           x=$\frac{7}{6}$£®

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