5 x 6+ 5X7/ 5X8+20 8 X9 -4 X15/12 X7-180 25 X9-25 X 7/-8 X30 -8 X 10 48 X 12 – 49 X15/-3 X 270 – 3 X 30 x là nhân xin lỗi do

1 bình luận về “5 x 6+ 5X7/ 5X8+20 8 X9 -4 X15/12 X7-180 25 X9-25 X 7/-8 X30 -8 X 10 48 X 12 – 49 X15/-3 X 270 – 3 X 30 x là nhân xin lỗi do”

1. Giải đáp:

    \frac{5xx6+5xx7}{5xx8+20}

   =\frac{5xx(6+7)}{5xx8+5xx4}

   =\frac{5xx(6+7)}{5xx(8+4)}

   =\frac{5xx13}{5xx12]

   =13/12

   ______________

   \frac{8xx9-4xx15}{12xx7-180}

   =\frac{4xx2xx9-4xx15}{12xx7-12xx15}

   =\frac{4xx(18-15)}{12xx(7-15)}

   =\frac{4xx3}{12xx(-8)}

   =\frac{12}{12xx(-8)}

   =-1/8

   ____________

   \frac{25xx9-25xx7}{-8xx30-8xx10}

   =\frac{25xx(9-7)}{-8xx(30+10)}

   =\frac{25xx2}{-8xx40}

   =\frac{50}{-320}

   =-5/32

   ___________

   \frac{48xx12-49xx15}{-3xx270-3xx30}

   =\frac{48xx3xx4-49xx3xx5}{-3xx(270+30)}

   =\frac{3xx(48xx4-49xx5)}{-3xx300}

   =\frac{192-245}{-300}

   =\frac{-53}{-300}

   =53/300

    

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