a)x-5/8x=15/2 b)5,5x=13/15 c) x:4 1/4=-3,2

Question

a)x-5/8x=15/2 b)5,5x=13/15 c) x:4 1/4=-3,2

in progress 0
Khánh Gia 2 tháng 2021-04-17T01:13:50+00:00 2 Answers 23 views 0

Answers ( )

  1. *Lời giải :

    `a) x -5/8x = 15/2`

    `-> (1 – 5/8)x = 15/2`

    `-> 3/8x = 15/2`

    `-> x = 15/2 : 3/8`

    `-> x = 20`

    Vậy `x=  20`

    `b) 5,5x = 13/15`

    `-> x = 13/15 : 5,5`

    `-> x = 26/165`

    Vậy `x = 26/165`

    `c) x : 4 1/4 = -3,2`

    `-> x : 17/4 = -3,2`

    `-> x = -3,2 . 17/4`

    `-> x = (-68)/5`

    Vậy `x = (-68)/5`

  2. a,  x – $\frac{5}{8}$x = $\frac{15}{2}$ 

    ( 1 – $\frac{5}{8}$ )x = $\frac{15}{2}$          

    $\frac{3}{8}$x =$\frac{15}{2}$      

    x = $\frac{15}{2}$ : $\frac{3}{8}$ = 20

    b, 5,5x = $\frac{13}{15}$     

    $\frac{11}{2}$x = $\frac{13}{15}$     

    x = $\frac{13}{15}$ : $\frac{11}{2}$ = $\frac{26}{165}$

    c, x : 4$\frac{1}{4}$ = -3,2   

    x : $\frac{17}{4}$ = $\frac{-16}{5}$   

    x      = $\frac{-16}{5}$ . $\frac{17}{4}$ =$\frac{-51}{5}$

    CHO MÌNH CTLHN NHA.

                                   

       

     

Leave an answer

Browse

2x(x - 3) + 5(x - 3) = 0 (x>0) , x = ? ( )