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* Trả lời:
\(\left(1\right)\) \(-3\left(1-2x\right)-4\left(1+3x\right)=-5x+5\)
\(\Leftrightarrow-3+6x-4-12x=-5x+5\)
\(\Leftrightarrow6x-12x+5x=3+4+5\)
\(\Leftrightarrow x=12\)
\(\left(2\right)\) \(3\left(2x-5\right)-6\left(1-4x\right)=-3x+7\)
\(\Leftrightarrow6x-15-6+24x=-3x+7\)
\(\Leftrightarrow6x+24x+3x=15+6+7\)
\(\Leftrightarrow33x=28\)
\(\Leftrightarrow x=\dfrac{28}{33}\)
\(\left(3\right)\) \(\left(1-3x\right)-2\left(3x-6\right)=-4x-5\)
\(\Leftrightarrow1-3x-6x+12=-4x-5\)
\(\Leftrightarrow-3x-6x+4x=-1-12-5\)
\(\Leftrightarrow-5x=-18\)
\(\Leftrightarrow x=\dfrac{18}{5}\)
\(\left(4\right)\) \(x\left(4x-3\right)-2x\left(2x-1\right)=5x-7\)
\(\Leftrightarrow4x^2-3x-4x^2+2x=5x-7\)
\(\Leftrightarrow-x-5x=-7\)
\(\Leftrightarrow-6x=-7\)
\(\Leftrightarrow x=\dfrac{7}{6}\)
\(\left(5\right)\) \(3x\left(2x-1\right)-6x\left(x+2\right)=-3x+4\)
\(\Leftrightarrow6x^2-3x-6x^2-12x=-3x+4\)
\(\Leftrightarrow-15x+3x=4\)
\(\Leftrightarrow-12x=4\)
\(\Leftrightarrow x=-\dfrac{1}{3}\)
Đề bài là gì bạn , chẳng nhẽ tính ?
a) (9x + 1) - (4x + 2) = 9x + 1 - 4x - 2 = (9x - 4x) + (1 - 2) = 5x - 1
b) (3x3 + 1) - (3x2 - 4x + 5) = 3x3 + 1 - 3x2 + 4x - 5 = 3x3 - 3x2 + 4x + (1 - 5) = 3x3 - 3x2 + 4x - 4
a) \(\left(9x+1\right)-\left(4x+2\right)\)
\(=9x+1-4x-2\)
\(=5x-1\)
b) \(\left(3x^2+1\right)-\left(3x^2-4x+5\right)\)
\(=3x^2+1-3x^2+4x-5\)
\(=4x-4\)
a, \(-4x+5+2x-1=3\Leftrightarrow-2x=-1\Leftrightarrow x=\dfrac{1}{2}\)
b, \(-2x+2=2\Leftrightarrow x=0\)
c, \(-2x-6=-8\Leftrightarrow x=1\)
a) \(3^{x+2}\cdot5^{y-3}=45^x\)
\(\Rightarrow3^{x+2}\cdot5^{y-3}=\left(3^2\right)^x\cdot5^x\)
\(\Rightarrow3^{x+2}\cdot5^{y-3}=3^{2x}\cdot5^x\)
\(\Rightarrow\left\{{}\begin{matrix}3^{x+2}=3^{2x}\\5^{y-3}=5^x\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}x+2=2x\\y-3=x\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}x=2\\y-3=2\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}x=2\\y=5\end{matrix}\right.\)
3x+1=9x
3x+1=32x
x+1=2x
1=2x-x
1=x
Vậy x=1
23x+2=4x+5
23x+2=22x+10
3x+2=2x+10
3x-2x=10-2
x=8
Vậy x=8
1.3x+1=9x
\(\Leftrightarrow3^{x+1}=3^{2x}\Rightarrow x+1=2x\Leftrightarrow x=1\)
2.23x+2=4x+5
\(\Leftrightarrow2^{3x+2}=2^{2x+10}\Rightarrow3x+2=2x+10\Leftrightarrow x=8\)