Câu hỏi của Vũ Đức Long Hải

Question

giúp nhanh vs làm câu 5 đến hết

456 · Accepted Answer

`5, x + 1/3 = 2/5 -(-1/3)``=> x + 1/3 = 2/5 + 1/3``=> x + 1/3 = 11/15``=> x = 11/15 - 1/3``=> x = = 2/5``6, 3/7 - x = 1/4-(-3/5)``=> 3/7 - x = 1/4 + 3/5``=> 3/7 - x = 17/20``=> x = 3/7 - 17/20``=> x = -59/140``7, x * (-3/7) = 5/21``=> x = 5/21 : (-3/7)``=> x = -5/9``8, 1 5/9 *x = 28/9``=> 14/9 * x = 28/9``=> x = 28/9 : 14/9``=> x = 2``9, x : (-2/5) = -15/16``=> x = -15/16 * (-2/5)``=> x = 3/8``10, -4/7 : x = -2/5``=> x = -4/7 : -2/5``=> x = 10/7``11, 2/3 x + 5/7 = 3/10``=> 2/3 x = 3/10 - 5/7``=> 2/3 x = -29/70``=> x = -29/70 : 2/3``=> x = -87/140``12, 3/4 x - 1/2 = 3/7``=> 3/4 x = 3/7 + 1/2``=> 3/4 x = 13/14``=> x = 13/14 : 3/4``=> x = 26/21``13, 1/2 x + 3/5 x = -33/25``=> (1/2 + 3/5)x = -33/25``=> 11/10 x = -33/25``=> x = -33/25 : 11/10``=> x = -6/5` Câu trả lời: `5, x + 1/3 = 2/5 -(-1/3)``=> x + 1/3 = 2/5 + 1/3``=> x + 1/3 = 11/15``=> x = 11/15 - 1/3``=> x = = 2/5``6, 3/7 - x = 1/4-(-3/5)``=> 3/7 - x = 1/4 + 3/5``=> 3/7 - x = 17/20``=> x = 3/7 - 17/20``=> x = -59/140``7, x * (-3/7) = 5/21``=> x = 5/21 : (-3/7)``=> x = -5/9``8, 1 5/9 *x = 28/9``=> 14/9 * x = 28/9``=> x = 28/9 : 14/9``=> x = 2``9, x : (-2/5) = -15/16``=> x = -15/16 * (-2/5)``=> x = 3/8``10, -4/7 : x = -2/5``=> x = -4/7 : -2/5``=> x = 10/7``11, 2/3 x + 5/7 = 3/10``=> 2/3 x = 3/10 - 5/7``=> 2/3 x = -29/70``=> x = -29/70 : 2/3``=> x = -87/140``12, 3/4 x - 1/2 = 3/7``=> 3/4 x = 3/7 + 1/2``=> 3/4 x = 13/14``=> x = 13/14 : 3/4``=> x = 26/21``13, 1/2 x + 3/5 x = -33/25``=> (1/2 + 3/5)x = -33/25``=> 11/10 x = -33/25``=> x = -33/25 : 11/10``=> x = -6/5`

456 · Answer

$14,\left(\dfrac{2}{3}x-\dfrac{4}{9}\right)\left(\dfrac{1}{2}+\dfrac{-3}{7}:x\right)=0$$\Rightarrow\left[{}\begin{matrix}\dfrac{2}{3}x-\dfrac{4}{9}=0\\dfrac{1}{2}+\dfrac{-3}{7}:x=0\end{matrix}\right.$$\Rightarrow\left[{}\begin{matrix}\dfrac{2}{3}x=\dfrac{4}{9}\\dfrac{-3}{7}:x=-\dfrac{1}{2}\end{matrix}\right.$$\Rightarrow\left[{}\begin{matrix}x=\dfrac{4}{9}:\dfrac{2}{3}=\dfrac{2}{3}\x=\dfrac{-3}{7}:-\dfrac{1}{2}=\dfrac{6}{7}\end{matrix}\right.$Vậy $x\in\left\{\dfrac{2}{3};\dfrac{6}{7}\right\}$$16,\dfrac{3}{7}x+2\dfrac{3}{8}=1\dfrac{2}{5}$$\Rightarrow\dfrac{3}{7}x+\dfrac{19}{8}=\dfrac{7}{5}$$\Rightarrow\dfrac{3}{7}x=\dfrac{7}{5}-\dfrac{19}{8}$$\Rightarrow\dfrac{3}{7}x=-\dfrac{39}{40}$`=> x = -39/40 : 3/7``=> x = -91/40`$18,\left(5x-1\right)\left(2x-\dfrac{1}{3}\right)=0$$\Rightarrow\left[{}\begin{matrix}5x-1=0\2x-\dfrac{1}{3}=0\end{matrix}\right.$$\Rightarrow\left[{}\begin{matrix}5x=1\2x=\dfrac{1}{3}\end{matrix}\right.$$\Rightarrow\left[{}\begin{matrix}x=\dfrac{1}{5}\x=\dfrac{1}{6}\end{matrix}\right.$Vậy $x\in\left\{\dfrac{1}{5};\dfrac{1}{6}\right\}$$19,-\dfrac{21}{13}x+\dfrac{1}{3}=\dfrac{2}{3}$$\Rightarrow-\dfrac{21}{13}x=\dfrac{2}{3}-\dfrac{1}{3}$`=> -21/13x = 1/3``=> x = 1/3 : -21/13``=> x = -13/63``20, 3/7 + 1/7 : x = 3/14``=> 1/7 : x = 3/14 - 3/7``=> 1/7 : x = -3/14``=> x = 1/7 : -3/14``=> x = -2/3``22, ` Câu trả lời: $14,\left(\dfrac{2}{3}x-\dfrac{4}{9}\right)\left(\dfrac{1}{2}+\dfrac{-3}{7}:x\right)=0$$\Rightarrow\left[{}\begin{matrix}\dfrac{2}{3}x-\dfrac{4}{9}=0\\dfrac{1}{2}+\dfrac{-3}{7}:x=0\end{matrix}\right.$$\Rightarrow\left[{}\begin{matrix}\dfrac{2}{3}x=\dfrac{4}{9}\\dfrac{-3}{7}:x=-\dfrac{1}{2}\end{matrix}\right.$$\Rightarrow\left[{}\begin{matrix}x=\dfrac{4}{9}:\dfrac{2}{3}=\dfrac{2}{3}\x=\dfrac{-3}{7}:-\dfrac{1}{2}=\dfrac{6}{7}\end{matrix}\right.$Vậy $x\in\left\{\dfrac{2}{3};\dfrac{6}{7}\right\}$$16,\dfrac{3}{7}x+2\dfrac{3}{8}=1\dfrac{2}{5}$$\Rightarrow\dfrac{3}{7}x+\dfrac{19}{8}=\dfrac{7}{5}$$\Rightarrow\dfrac{3}{7}x=\dfrac{7}{5}-\dfrac{19}{8}$$\Rightarrow\dfrac{3}{7}x=-\dfrac{39}{40}$`=> x = -39/40 : 3/7``=> x = -91/40`$18,\left(5x-1\right)\left(2x-\dfrac{1}{3}\right)=0$$\Rightarrow\left[{}\begin{matrix}5x-1=0\2x-\dfrac{1}{3}=0\end{matrix}\right.$$\Rightarrow\left[{}\begin{matrix}5x=1\2x=\dfrac{1}{3}\end{matrix}\right.$$\Rightarrow\left[{}\begin{matrix}x=\dfrac{1}{5}\x=\dfrac{1}{6}\end{matrix}\right.$Vậy $x\in\left\{\dfrac{1}{5};\dfrac{1}{6}\right\}$$19,-\dfrac{21}{13}x+\dfrac{1}{3}=\dfrac{2}{3}$$\Rightarrow-\dfrac{21}{13}x=\dfrac{2}{3}-\dfrac{1}{3}$`=> -21/13x = 1/3``=> x = 1/3 : -21/13``=> x = -13/63``20, 3/7 + 1/7 : x = 3/14``=> 1/7 : x = 3/14 - 3/7``=> 1/7 : x = -3/14``=> x = 1/7 : -3/14``=> x = -2/3``22, `

456 · Answer

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