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a) \(\frac{3}{4}x-\frac{1}{4}=2\left(x-3\right)+\frac{1}{4}x\)
\(\frac{3}{4}x-\frac{1}{4}=2x-6+\frac{1}{4}x\)
\(\frac{3}{4}x-2x-\frac{1}{4}x=\frac{1}{4}-6\)
\(x\left(\frac{3}{4}-2-\frac{1}{4}\right)=-\frac{23}{4}\)
\(-\frac{3}{2}x=-\frac{23}{4}\)
\(x=-\frac{23}{4}\div\left(-\frac{3}{2}\right)\)
\(x=\frac{23}{6}\)
=> 20 - 4x - 3 - 3x = - 9
=> 17 - x = - 9
=> x = 26
Vậy x = 26
K mk nha
\(-\left(\frac{1}{2}.x-\frac{3}{4}\right)-\left(-x+1\right)=-\frac{3}{2}\) \(\frac{3}{2}\)
<=> \(-\frac{1}{2}x+\frac{3}{4}+x-1=\frac{-3}{2}\)
<=> \(\frac{1}{2}x-\frac{1}{4}=\frac{-3}{2}\)
<=> \(\frac{1}{2}x=-\frac{5}{4}\)
<=> \(x=\frac{-5}{2}\)
\(-5.\left(2x-\frac{2}{5}\right)+\frac{1}{3}x.\left(-x+1\right)\) \(=-\frac{3}{2}\)
<=> \(-10x+2-\frac{x^2}{3}+\frac{1}{3}x\) \(=\frac{-3}{2}\)
làm nốt nha
mk phải đi học rồi
a)=1/2 . 8/15 - 3/4.47/9
=4/15 - 47/12
=-73/20
b)=2-1/3 . -21/20
=2+7/20
=47/20
\(a,-4\left(2x+9\right)=\left(-8x+3\right)\)
\(\Rightarrow-8x-36=-8x+3\)
\(\Rightarrow-8x+8x=3+36\)
\(\Rightarrow0x=39\left(vô-lí\right)\)
\(b,1+x-2\left(5+3x\right)=4-5x\)
\(\Rightarrow1+x-10-6x=4-5x\)
\(\Rightarrow x-6x+5x=4+10-1\)
\(\Rightarrow0x=13\left(vô-lí\right)\)
\(c,3\left(2-x\right)+1=-3x+7\)
\(\Rightarrow6-3x+1=-3x+7\)
\(\Rightarrow-3x+3x=7-1-6\)
\(\Rightarrow0x=0\Rightarrow x=0\)
a) \(-2\left(x-\dfrac{1}{3}\right)-5\left(x+\dfrac{1}{3}\right)=\dfrac{1}{2}x\)
\(\Leftrightarrow-2x+\dfrac{2}{3}-5x-\dfrac{5}{3}=\dfrac{1}{2}x\)
\(\Leftrightarrow-7x-1=\dfrac{1}{2}x\)
\(\Leftrightarrow-7x-\dfrac{1}{2}x=1\)
\(\Leftrightarrow-\dfrac{15}{2}x=1\)
\(\Leftrightarrow x=1:\left(-\dfrac{15}{2}\right)=-\dfrac{2}{15}\)
b) \(-\left(\dfrac{1}{2}x-\dfrac{3}{4}\right)-\left(-x+1\right)=\dfrac{3}{2}\)
\(\Leftrightarrow-\dfrac{1}{2}x+\dfrac{3}{4}+x-1=\dfrac{3}{2}\)
\(\Leftrightarrow\dfrac{1}{2}x-\dfrac{1}{4}=\dfrac{3}{2}\)
\(\Leftrightarrow\dfrac{1}{2}x=\dfrac{3}{2}+\dfrac{1}{4}=\dfrac{7}{4}\)
\(\Leftrightarrow x=\dfrac{7}{4}:\dfrac{1}{2}\)
\(\Leftrightarrow x=\dfrac{7}{2}\)
cảm ơn nha