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\(a,0,5x-\frac{2}{3}x=\frac{7}{12}\Rightarrow\frac{1}{2}x-\frac{2}{3}x=\frac{7}{12}\)
\(\Rightarrow x\left(\frac{1}{2}-\frac{2}{3}\right)=\frac{7}{12}\Rightarrow x\cdot\left(\frac{3}{6}-\frac{4}{6}\right)=\frac{7}{12}\)
\(\Rightarrow x\cdot\left(-1\right)=\frac{7}{12}\Rightarrow x=\frac{7}{12}:\left(-1\right)=\frac{7}{-12}\)
\(c,\frac{\left(x-5\right)}{12}\cdot\frac{9}{29}=\frac{-6}{29}\Rightarrow\frac{\left(x-5\right)}{12}=\frac{-6}{29}:\frac{9}{26}\)
\(\frac{\Rightarrow\left(x-5\right)}{12}=\frac{-6}{9}=\frac{-2}{3}\Rightarrow x-5=-\frac{2}{3}\cdot12\)
\(\Rightarrow x-5=\frac{-24}{3}=-8\Rightarrow x=-8+5=-3\)
\(a,0,5x-\frac{2}{3}x=\frac{7}{12}\)
\(\Rightarrow\frac{1}{2}x-\frac{2}{3}x=\frac{7}{12}\)
\(\Rightarrow-\frac{1}{6}x=\frac{7}{12}\)
\(\Rightarrow x=-\frac{7}{2}\)
\(c,\frac{x-5}{12}\cdot\frac{9}{29}=-\frac{6}{29}\)
\(\Rightarrow\frac{x-5}{12}=-\frac{2}{3}\)
\(\Rightarrow x-5=12.\left(-\frac{2}{3}\right)\)
\(\Rightarrow x-5=-8\)
\(\Rightarrow x=-3\)
dễ mà bn, ta sử dụng tính chất phân phối của phép trừ đối với phép nhân:
0,5=\(\frac{1}{2}\)
\(\frac{1}{2}\)x - \(\frac{2}{3}\)x = \(\frac{7}{12}\)
x ( \(\frac{1}{2}\)- \(\frac{2}{3}\)) = \(\frac{7}{12}\)
x . \(\frac{-1}{6}\)= \(\frac{7}{12}\)
x = \(\frac{7}{12}\): \(\frac{-1}{6}\)
x = \(\frac{7}{12}\). -6
x = \(-3\frac{1}{2}\)
( like cho mk lunk ha, bài này dễ, kiểm tra lại ha! Nếu mk làm sai thì còn sửa nữa!!!!!!!!!)
0,5x - \(\dfrac{2}{3}\)x = \(\dfrac{5}{12}\)
\(\dfrac{5}{10}\)x - \(\dfrac{2}{3}\)x = \(\dfrac{5}{12}\)
(\(\dfrac{1}{2}\) - \(\dfrac{2}{3}\)) .x=\(\dfrac{5}{12}\)
(\(\dfrac{3}{6}\)
=>(0.5-2/3)x=5/12
=>-1/6x=5/12
=>x=5/12:-1/6
=>=-5/2
vậy x=-5/2
\(0,5x-\frac{2}{3}x=\frac{5}{12}\)
\(x\left(0.5-\frac{2}{3}\right)=\frac{5}{12}\)
\(x.\left(-\frac{1}{16}\right)=\frac{5}{12}\)
\(x=\frac{5}{12}:-\frac{1}{16}=-2.5\Leftrightarrow-\frac{5}{2}\)
Giải: 1/2x - 2/3x = 5/12
( 1/2 - 2/3 ) x = 5/12
-1/6x = 5/12
x = 5/12 : -1/6
x = -5/2
\(0,5-\frac{2}{3}x=\frac{5}{12}\)
\(=\frac{1}{2}x=\frac{5}{12}+\frac{2}{3}\)
\(=\frac{1}{2}x=\frac{13}{12}\)
\(\Rightarrow x=\frac{13}{12}:\frac{1}{2}\)
\(\Rightarrow x=\frac{6}{13}\)
Vậy x = \(\frac{6}{13}\)
(#)
:3
x. (0,5-2/3)= 5/12
x. -1/6= 5/12
x= 5/12 : -1/6
x= -5/2