Tìm x a) 4/x =-10/25 b) 11/12 . x + 3/4 = -1/6 c) 3 – (1/6 – x

2 bình luận về “Tìm x a) 4/x =-10/25 b) 11/12 . x + 3/4 = -1/6 c) 3 – (1/6 – x”

1. Giải đáp:

    

   Lời giải và giải thích chi tiết:

    a)

   $\frac{4}{x}$ = $\frac{-10}{25}$

   => -10x = 4.25

   => x = -10

   b)

   $\frac{11}{12}$.x + $\frac{3}{4}$ = $\frac{-1}{6}$

   <=> $\frac{11}{12}$.x = $\frac{-11}{12}$

   => x = -1

   c)

   3-($\frac{1}{6}$-x).$\frac{2}{3}$ = $\frac{2}{3}$

   <=> -($\frac{1}{6}$-x).$\frac{2}{3}$ = $\frac{-7}{3}$

   <=>-$\frac{1}{9}$-$\frac{2x}{3}$ = $\frac{-7}{3}$

   <=>-$\frac{2x}{3}$ = $\frac{-7}{3}$+$\frac{1}{9}$

   <=>-$\frac{2x}{3}$ = $\frac{-20}{9}$

   <=>-18x = -60

   <=> x = $\frac{10}{3}$

   Trả lời
2. #Lilies

   a) 4/x = -10/25

   => 4/x = -2/5

   => x = 4 : (-2/5)

   => x = 4 xx (-5/2)

   => x = -10

   Vậy x = -10

   ____________________________

   b) 11/12 . x + 3/4 = -1/6

   => 11/12 . x = -1/6 – 3/4

   => 11/12 . x = -2/12 – 9/12

   => 11/12 . x = -11/12

   => x = -11/12 : 11/12

   => x = -1

   Vậy x = -1

   ____________________________

   c) 3 – (1/6 – x) . 2/3 = 2/3

   => (1/6 – x) . 2/3 = 3 – 2/3

   => (1/6 – x) . 2/3 = 9/3 – 2/3

   => (1/6 – x) . 2/3 = 7/3

   => 1/6 – x = 7/3 : 2/3

   => 1/6 – x = 7/3 xx 3/2

   => x = 1/6 – 7/2

   => x = 1/6 – 21/6

   => x = -10/3

   Vậy x = -10/3

    

   Trả lời