Trang chủ » Hỏi đáp » Môn Toán a) 2/3+1/3:x = -3/4 b) x/-4 = -9/5 c) 2(x-2/5)^3 = -16/27 SOSSSSSSS 03/03/2024 a) 2/3+1/3:x = -3/4 b) x/-4 = -9/5 c) 2(x-2/5)^3 = -16/27 SOSSSSSSS
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
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
⇒ $\frac{1}{3}$ : x = -$\frac{3}{4}$ – $\frac{2}{3}$
⇒ $\frac{1}{3}$ : x = -$\frac{17}{12}$
⇒ x = $\frac{1}{3}$ : -$\frac{17}{12}$
⇒ -$\frac{4}{17}$
⇒ x × 5 = -9 × -4
⇒x=36 ÷ 5
⇒ x= $\frac{36}{5}$
⇒(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=$\frac{-4}{15}$