Tìm x biết 3.x-60%.x=1,5
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a)\(\left|x-3,5\right|=0,25\)
\(\Leftrightarrow\orbr{\begin{cases}x-3,5=0,25\\x-3,5=-0,25\end{cases}\Leftrightarrow\orbr{\begin{cases}x=3,75\\x=3,25\end{cases}}}\)
b)\(\left|1,5-x\right|=1,75\)
\(\Leftrightarrow\orbr{\begin{cases}1,5-x=1,75\\1,5-x=-1,75\end{cases}\Leftrightarrow\orbr{\begin{cases}x=-0,25\\x=3,25\end{cases}}}\)
c)\(\left|x-1,5\right|=1,5\)
\(\Leftrightarrow\orbr{\begin{cases}x-1,5=1,5\\x-1,5=-1,5\end{cases}\Leftrightarrow\orbr{\begin{cases}x=3\\x=0\end{cases}}}\)
\(x+1,5=2\cdot\frac{x}{3}\)
\(x+1,5=\frac{2x}{3}\)
\(x=\frac{2x}{3}-\frac{3}{2}\)
\(x=\frac{4x}{6}-\frac{9}{6}\)
\(x=\frac{4x-9}{6}\)
\(x\cdot6=4x-9\)
\(4x-6x=9\)
\(-2x=9\Rightarrow x=-\frac{9}{2}\)
\(x+1,5=\frac{2.x}{3}\)
\(\Leftrightarrow x-\frac{2x}{3}=-\frac{3}{2}\)
\(\Leftrightarrow\frac{3x}{3}-\frac{2x}{3}=-\frac{3}{2}\)
\(\Leftrightarrow\frac{3x-2x}{3}=-\frac{3}{2}\)
\(\Leftrightarrow\frac{x}{3}=-\frac{3}{2}\)
<=> 2x=-9
<=> x=-9/2
<=> x=-4,5
X – 60 : 15 = 20,5
=> X – 60 = 307,5
=> X = 367,5
X : 4 + 12 = 23
=> X : 4 = 11
=> X = 44
( x – 60 ) : 15 = 20
=> x – 60 = 300
=> x = 360
3 .(x + 7)- 15= 27
=> 3 .(x + 7) = 42
=> x + 7 = 14
=> x = 7
2. ( x – 5 )- 17 = 24 + 6 x 1,5
=> 2. ( x – 5 ) - 17 = 33
=> 2. ( x – 5 ) = 50
=> x - 5 = 25
=> x = 30
\(a,x-60:15=20,5\)
\(x-4=20,5\)
\(x=20,5+4=24,5\)
\(b,x:4+12=23\)
\(x:4=23-12=11\)
\(x=11.4=44\)
\(c,\)\(\left(x-60\right)\)\(:15=20\)
\(x-60=20.15=300\)
\(x=300+60=360\)
\(d,3\left(x+7\right)\)\(-15=27\)
\(3\left(x+7\right)\)\(=27+15=42\)
\(x+7=42:3=14\)
\(x=14-7=7\)
\(e,2\left(x-5\right)\)\(-17=24+6.1,5=24+9=33\)
\(2\left(x-5\right)\)\(=33+17=50\)
\(x-5=50:2=25\)
\(x=25+5=30\)
=>........................
\(\left(x+1\right)^3+\left(x-2\right)^3-2x^2\left(x-1,5\right)=3\)
\(\Leftrightarrow x^3+3x^2+3x+1+x^3-6x^2+12x-8-2x^3+3x^2=3\)
\(\Leftrightarrow15x=10\Leftrightarrow x=\dfrac{2}{3}\)
\(\dfrac{x}{1,5}=\dfrac{3}{2,25}\)
<=> \(2,25x=1,5\times3\)
<=> \(2,25x=4,5\)
<=> \(x=\dfrac{4,5}{2,25}=2\)
3.x-3/5. x=1,5
x.(3-3/5)=3/2
x.12/5=3/2
x=3/2:12/5
x=5/8
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