x/15+7/20=73/60 11/8+13/6=85/x -7/x+8/15=-1/20 tìm x

2 bình luận về “x/15+7/20=73/60 11/8+13/6=85/x -7/x+8/15=-1/20 tìm x”

1. x/15+7/20=73/60

   (4x)/60+21/60=73/60

   => 4x+21=73

            4x=73-21

            4x=52

              x=52:4

              x=13

     Vậy x=13

   _______________________________

   11/8+13/6=85/x

   33/24+52/24=85/x

           85/24=85/x

   => x=24

   Vậy x=24

   ________________________________

   (-7)/x+8/15=(-1)/20

             (-7)/x=(-1)/20-8/15

             (-7)/x=(-3)/60-32/60

             (-7)/x=(-35)/60

          (-35)/(5x)=(-35)/60

    => 5x=60

              x=60:5

              x=12

   Vậy x=12

   $\text{@Hy~Hoctotnha}$

            

   Trả lời
2. $\text{a, }{\displaystyle \frac{x}{15}}\text{ + }{\displaystyle \frac{7}{20}}\text{=}{\displaystyle \frac{73}{60}}$

   $\text{ => }{\displaystyle \frac{x}{15}}\text{ = }{\displaystyle \frac{73}{60}}\text{ – }{\displaystyle \frac{7}{20}}$

   $\text{ => }{\displaystyle \frac{x}{15}}\text{ = }{\displaystyle \frac{13}{15}}$

   $\text{ => x = 13 }$

   $\text{ Vậy x = 13 }$

   $\text{ b, }{\displaystyle \frac{11}{8}}\text{ + }{\displaystyle \frac{13}{6}}\text{ = }{\displaystyle \frac{85}{x}}$

   $\text{ => }{\displaystyle \frac{85}{24}}\text{ = }{\displaystyle \frac{85}{x}}$

   $\text{ => x = 24 }$
   $\text{ Vậy x = 24 }$

   $\text{c, }{\displaystyle \frac{-7}{x}}\text{ + }{\displaystyle \frac{8}{15}}\text{ = }{\displaystyle \frac{-1}{20}}$

   $\text{ => }{\displaystyle \frac{-7}{x}}\text{ = }{\displaystyle \frac{-1}{20}}\text{ – }{\displaystyle \frac{8}{15}}$

   $\text{ => }{\displaystyle \frac{-7}{x}}\text{ = }{\displaystyle \frac{-7}{12}}$
   $\text{ => x = 12 }$

   $\text{ Vậy x = 12 }$
   chúc bạn học tốt

   #lanhh 

   Trả lời