Question

2x + (-1/2)=-2/3

0.75-(-2x) = 4/5

(2x+5).(1-x) =0

Bik làm câu nào làm câu đó đầy đủ hộ minh nhé 

Ai cmt nhanh mình tick cho nhe

Answer 1

cmt gi may co bai tu di ma lam bat ng ta lam cho may chep ha

Answer 2

\(2x+\frac{-1}{2}=\frac{-2}{3}\)

<=>\(2x=\frac{-2}{3}-\frac{-1}{2}=\frac{-1}{6}\)

<=>\(x=\frac{-1}{6}:2=-\frac{1}{2}\)

Vây \(x=-\frac{1}{2}\)

\(0.75-\left(-2x\right)=\frac{4}{5}\)

<=>\(\frac{3}{5}+2x=\frac{4}{5}\)

<=>\(2x=\frac{4}{5}-\frac{3}{5}=\frac{1}{5}\)

<=>\(x=\frac{1}{5}:2=\frac{1}{10}\)

Vậy \(x=\frac{1}{10}\)

\(\left(2x+5\right)\left(1-x\right)=0\)

<=>\(2x+5=0\)hoặc \(1-x=0\)

<=>\(x=\frac{5}{2}\)hoặc \(x=1\)

Vậy \(x=\frac{5}{2}\)hoặc \(x=1\)

Answer 3

+) \(2x+\left(\frac{-1}{2}\right)=\frac{-2}{3}\)

\(\Rightarrow2x-\frac{1}{2}=\frac{-2}{3}\)

\(\Rightarrow2x=\frac{-2}{3}+\frac{1}{2}\)

\(\Rightarrow2x=\frac{-1}{6}\)

\(\Rightarrow x=\frac{-1}{6}:2\)

\(\Rightarrow x=\frac{-1}{12}\)

Vậy  \(x=\frac{-1}{12}\)

b) \(0,75-\left(-2x\right)=\frac{4}{5}\)

\(\Rightarrow\frac{3}{4}+2x=\frac{4}{5}\)

\(\Rightarrow2x=\frac{4}{5}-\frac{3}{4}\)

\(\Rightarrow2x=\frac{1}{20}\)

\(\Rightarrow x=\frac{1}{20}:2\)

\(\Rightarrow x=\frac{1}{40}\)

Vậy  \(x=\frac{1}{40}\)

c) \(\left(2x+5\right)\left(1-x\right)=0\)

\(\Rightarrow\orbr{\begin{cases}2x+5=0\\1-x=0\end{cases}}\Rightarrow\orbr{\begin{cases}2x=-5\\x=1\end{cases}}\Rightarrow\orbr{\begin{cases}x=\frac{-5}{2}\\x=1\end{cases}}\)

Vậy  \(x=\frac{-5}{2}\)hoặc \(x=1\)

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