Toán Lớp 5: a, x x 25,6 = 128 b, 17,8 x x = 360,05 – 9.,05 c, 29,5 x ( x + 10,25) = 376,125 d, 748 : ( x – 31,72) =13,6

0 bình luận về “Toán Lớp 5: a, x x 25,6 = 128 b, 17,8 x x = 360,05 – 9.,05 c, 29,5 x ( x + 10,25) = 376,125 d, 748 : ( x – 31,72) =13,6”

1. $\text{a) x × 25,6 = 128}$

         $\text{x = 128 : 25,6 }$

         $\text{x = 5}$

   $\text{b) 17,8 × x = 360,05 – 9,05}$

       $\text{17,8 × x = 351}$

             $\text{ x = 351 : 17,8}$

             $\text{x = 19,7191}$

   $\text{c) 29,5 × ( x + 10,25 ) = 376,125}$

           $\text{x + 10,25 = 376,125 : 29,5}$

           $\text{x + 10,25 = 12,75}$

             $\text{x = 12,75 – 10,25}$

           $\text{  x = 2,5}$

   $\text{d) 748 : ( x – 31,72 ) = 13,6}$

           $\text{ x – 31,72 = 748 : 13,6}$

           $\text{x – 31,72 = 55}$

               $\text{ x = 55 + 31,72}$

               $\text{x = 86,72}$

   $\text{Xin hay nhất và 5 sao ạ}$

2. a,

   x xx 25,6 = 128

   x=128 : 25,6

   x=5

   ______________________

   b,

   17,8 xx x = 360,05 – 9,05

   17,8 xx x = 351

   x=351:17,8

   x=19,7191

   __________________________

   c,

   29,5 xx (x+10,25) = 376,125

   x+10,25 = 376,125 : 29,5

   x+10,25=12,75

   x=12,75-10,25

   x=2,5

   _____________________________

   d,

   748 : (x-31,72) = 13,6

   x-31,72=784:13,6

   x-31,72=55

   x=55+31,72

   x=86,72