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

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

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