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1
\(\left(x-2\right):2.3=6\)
\(\Leftrightarrow\left(x-2\right):2=2\)
\(\Leftrightarrow\left(x-2\right)=4\)
\(\Leftrightarrow x=4+2=6\)
c) ta có
\(\left[\left(2x+1\right)+1\right]m:2=625\)
\(\Leftrightarrow\left[\left(2x+1\right)+1\right]\left\{\left[\left(2x+1\right)-1\right]:2+1\right\}=1250\)
\(\Leftrightarrow\left(2x+1\right)^2+1-1:2+1=1250\)
\(\Leftrightarrow\left(2x+1\right)^2+1-2+1=1250\)
\(\Leftrightarrow\left(2x+1\right)^2+1-2=1249\)
\(\Leftrightarrow\left(2x+1\right)^2+1=1251\)
\(\Leftrightarrow\left(2x+1\right)^2=1250\)
...
2
\(\left(x-\frac{1}{2}\right).\frac{5}{3}=\frac{7}{4}-\frac{1}{2}\)
\(\Leftrightarrow\left(x-\frac{1}{2}\right).\frac{5}{3}=\frac{5}{4}\)
\(\Leftrightarrow\left(x-\frac{1}{2}\right)=\frac{5}{4}:\frac{5}{3}\)
\(\Leftrightarrow\left(x-\frac{1}{2}\right)=\frac{5}{4}.\frac{3}{5}\)
\(\Leftrightarrow x-\frac{1}{2}=\frac{3}{4}\)
\(\Leftrightarrow x=\frac{3}{4}+\frac{1}{2}=\frac{5}{4}\)
tốt nhất để tớ chả lời cho
a,4/7.x=1/5+2/3
4/7.x=13/15
13/15:4/7=91/60
b
=-7/8.x=1/3-2/9
-7/8.x=1/9
x=1/9:7/8
x=8/63
c
5/7:x=1/6-4/5
5/7:x=-19/30
x=-116/133
a)\(5\left(2x-4\right)-3\left(x+1\right)=-2\left(x-9\right)\)
\(10x-20-3x-3=18-2x\)
\(7x-23=18-2x\)
\(7x-23-18+2x=0\)
\(9x-41=0\)
\(\Rightarrow x=\frac{41}{9}\)
b)\(\left|2x-1\right|+1=x\)
\(\Rightarrow\hept{\begin{cases}2x-1+1=x\\1-2x+1=x\end{cases}\Rightarrow}\hept{\begin{cases}2x=x\\2-2x=x\end{cases}\Rightarrow}\hept{\begin{cases}x=0\\x=\frac{2}{3}\left(koTM\right)\end{cases}}\)
một, 10x -20 -3x -3 + 2x -18 = 0
<=> 9x = 41
<=> x = 41/9
b, \(\orbr{\begin{cases}2x-1=x-1\\2x-1=1-x\end{cases}}\) đk th1 (x> hoặc =1/2 ) th2 x <1/2
\(\orbr{\begin{cases}x=0\\x=\frac{2}{3}\end{cases}}\)
vô nghiệm