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a) \(x\left(2x-1\right)-6x+3=0\)
\(\Leftrightarrow x\left(2x-1\right)-3\left(2x-1\right)=0\)
\(\Leftrightarrow\left(x-3\right)\left(2x-1\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x-3=0\\2x-1=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=3\\x=\frac{1}{2}\end{cases}}\)
b) \(x^2\left(x+1\right)-9x-9=0\)
\(\Leftrightarrow x^2\left(x+1\right)-9\left(x+1\right)=0\)
\(\Leftrightarrow\left(x^2-9\right)\left(x+1\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x+1=0\\x^2-9=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=-1\\x=\pm\sqrt{9}=\pm3\end{cases}}\)
a) x(2x - 1) - 6x + 3 = 0
=> x(2x - 1) - 3(2x - 1) = 0
=> (x - 3)(2x - 1) = 0
=> \(\orbr{\begin{cases}x-3=0\\2x-1=0\end{cases}}\)
=> \(\orbr{\begin{cases}x=3\\x=\frac{1}{2}\end{cases}}\)
b) x2(x + 1) - 9(x + 1) = 0
=> (x2 - 9)(x + 1) = 0
=> \(\orbr{\begin{cases}x^2-9=0\\x+1=0\end{cases}}\)
=> \(\orbr{\begin{cases}x=\pm3\\x=-1\end{cases}}\)
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d) \(4x^2-9-x\left(2x-3\right)=0\)
\(\Leftrightarrow4x^2-9-2x^2+3x=0\)
\(\Leftrightarrow2x^2+3x-9=0\)
\(\Delta=3^2-4.2.\left(-9\right)=9+72=81\)
Vậy pt có 2 nghiệm phân biệt
\(x_1=\frac{-3+\sqrt{81}}{4}=\frac{-3}{2}\);\(x_1=\frac{-3-\sqrt{81}}{4}=-3\)
e) \(x^3+5x^2+9x=-45\)
\(\Leftrightarrow x^3+5x^2+9x+45=0\)
\(\Leftrightarrow x^2\left(x+5\right)+9\left(x+5\right)=0\)
\(\Leftrightarrow\left(x^2+9\right)\left(x+5\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x^2+9=0\\x+5=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=\pm3i\\x=-5\end{cases}}\)
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a: Ta có: \(\left(x+2\right)\left(x+3\right)-\left(x-2\right)\left(x+5\right)=6\)
\(\Leftrightarrow x^2+5x+6-x^2-3x+10=6\)
\(\Leftrightarrow2x=-10\)
hay x=-5
b: Ta có: \(\left(3x+2\right)\left(2x+9\right)-\left(x+2\right)\left(6x+1\right)=\left(x+1\right)-\left(x-6\right)\)
\(\Leftrightarrow6x^2+27x+4x+18-6x^2-x-12x-2=x+1-x+6\)
\(\Leftrightarrow18x+16=7\)
hay \(x=-\dfrac{1}{2}\)
c: Ta có: \(3\left(2x-1\right)\left(3x-1\right)-\left(2x-3\right)\left(9x-1\right)=0\)
\(\Leftrightarrow3\left(6x^2-2x-3x+1\right)-\left(18x^2-2x-27x+3\right)=0\)
\(\Leftrightarrow18x^2-15x+3-18x^2+27x-3=0\)
hay x=0
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TÌM X
a) (3x+2)(2x+9)-(6x+1)(x+2)=7
=> 6x2 + 31x +18 - 6x2 - 13x - 2 - 7 = 0
=> 18x + 9 = 0 => 9(2x + 1) = 0 => 2x + 1 = 0 => x = -1/2
b) (x-2)(x+5)-(x+3)(x+2)=-6
=> x2 + 3x - 10 - x2 - 5x -6 + 6 = 0 => -2x -10 = 0 => -2(x + 5) = 0
=> x + 5 = 0 => x = -5
c) 3(2x-1)(3x-1)-(2x-3)(9x-1)=0
=> 18x2 - 15x +3 - 18x2 + 29x -3 = 0 => 14x = 0 => x = 0
a) \(\left(3x+2\right)\left(2x+9\right)-\left(6x+1\right)\left(x+2\right)=7\\\Rightarrow 6x^2+31x+18-6x^2-16x-2-7=0\\ \Rightarrow18x+9=0\Rightarrow9\left(2x+1\right)=0\Rightarrow2x+1=0\Rightarrow x=-\frac{1}{2}\)
b) \(\left(x-2\right)\left(x+5\right)-\left(x+3\right)\left(x+2\right)=-6\\ \Rightarrow x^2+3x-10-x^2-5x-6+6=0\\ \Rightarrow-2x-10=0\\ \Rightarrow-2\left(x+5\right)=0\\ \Rightarrow x+5=0\\ \Rightarrow x=-5\)
c) \(3\left(2x-1\right)\left(3x-1\right)-\left(2x-3\right)\left(9x-1\right)=0\\ \Rightarrow18x^2-15x+3-18x^2+29x-3=0\\ \Rightarrow14x=0\\ \Rightarrow x=0\)
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\(\frac{2x+3}{2x+1}-\frac{2x+5}{2x+7}=\frac{1-6x^2+9x-9}{\left(2x+1\right)\left(2x+7\right)}\)
\(\Leftrightarrow\frac{\left(2x+3\right)\left(2x+7\right)-\left(2x+5\right)\left(2x-1\right)}{\left(2x+1\right)\left(2x+7\right)}=\frac{1-6x^2+9x-9}{\left(2x+1\right)\left(2x+7\right)}\)
\(\Rightarrow\left(2x+3\right)\left(2x+7\right)-\left(2x+5\right)\left(2x+1\right)=1-6x^2+9x-9\)
\(\Leftrightarrow4x^2+20x+21-4x^2-12x-5=1-6x^2+9x-9\)
\(\Leftrightarrow8x-16=1-6x^2+9x-9\)
\(\Leftrightarrow8x-16-1+6x^2-9x+9=0\)
\(\Leftrightarrow6x^2-x-8=0\)
Tự làm nốt nha
Trl
-Bạn chuyên toán thcs làm đúng r nhé !~
Học tốt
nhé bạn ~
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Đề bài là giải các phương trình nha :Đ
\(b,\left(2x+1\right)^2=9\)
\(\left(2x+1\right)^2=3^2\)
\(\Rightarrow\orbr{\begin{cases}2x+1=3\\2x+1=-3\end{cases}\Rightarrow\orbr{\begin{cases}2x=2\\2x=-4\end{cases}\Rightarrow}\orbr{\begin{cases}x=1\\x=-2\end{cases}}}\)
\(c,x^3+5x^2-4x-20=0\)
\(x^2\left(x+5\right)-4\left(x+5\right)=0\)
\(\left(x^2-4\right)\left(x+5\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x^2-4=0\\x+5=0\end{cases}\Rightarrow\orbr{\begin{cases}x^2=4\\x=5\end{cases}}}\)
\(\Rightarrow\orbr{\begin{cases}x=2\\x=-2\end{cases};x=5}\)
ko phải mk lười đâu , cái này bn làm nó mới có ý nghĩa , cố gắng nốt nha !
\(9x\left(2x-3\right)-6x+9=0\)
=>\(9x\left(2x-3\right)-3\left(2x-3\right)=0\)
=>\(\left(9x-3\right)\left(2x-3\right)=0\)
=>\(3\left(3x-1\right)\left(2x-3\right)=0\)
=>\(\orbr{\begin{cases}3x-1=0\\2x-3=0\end{cases}\Rightarrow\orbr{\begin{cases}x=\frac{1}{3}\\x=\frac{3}{2}\end{cases}}}\)