a) 2/3+1/3:x = -3/4 b) x/-4 = -9/5 c) 2(x-2/5)^3 = -16/27 SOSSSSSSS

2 bình luận về “a) 2/3+1/3:x = -3/4 b) x/-4 = -9/5 c) 2(x-2/5)^3 = -16/27 SOSSSSSSS”

1. a) $\frac{2}{3}$ + $\frac{1}{3}$ : x =-$\frac{3}{4}$ 
   ⇒ $\frac{1}{3}$ : x = -$\frac{3}{4}$ – $\frac{2}{3}$
   ⇒ $\frac{1}{3}$ : x = -$\frac{17}{12}$
   ⇒ x = $\frac{1}{3}$ : -$\frac{17}{12}$
   ⇒ -$\frac{4}{17}$

   b) $\frac{x}{-4}$ = -$\frac{-9}{5}$
   ⇒ x × 5 = -9 × -4
   ⇒x=36 ÷ 5
   ⇒ x= $\frac{36}{5}$ 

   c) 2(x-$\frac{2}{5}$ )^3 = $\frac{-16}{27}$ 
   ⇒(x-$\frac{2}{5}$ )^3 = $\frac{-16}{27}$ ÷ 2
   ⇒(x-$\frac{2}{5}$ )^3 = $\frac{-8}{27}$
   ⇒ x-$\frac{2}{5}$ = $\frac{-2}{3}$ 
   ⇒x = $\frac{2}{5}$ + $\frac{-2}{3}$ 
   ⇒x=$\frac{-4}{15}$
   

   Trả lời
2. a)

   2/3+1/3:x=-3/4

   =>1/3:x=-3/4-2/3

   =>1/3:x=-17/12

   =>x=1/3:(-17/12)

   =>x=-4/17

   Vậy x=-4/17

   $$

   b)

   x/(-4)=-9/5

   =>x.5=(-4).(-9)

   =>x.5=36

   =>x=36/5

   Vậy x=36/5

   $$

   c)

   2.(x-2/5)^3=-16/27

   =>(x-2/5)^3=(-16/27):2

   =>(x-2/5)^3=-8/27

   =>(x-2/5)^3=(-2/3)^3

   =>x-2/5=-2/3

   =>x=-2/3+2/5

   =>x=-4/15

   Vậy x=-4/15

    

   Trả lời