x-36=4(TÌM X)
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782 - X = 215 36 : x = 4
X= 782 – 125 x =36 : 4
X= 657 x = 9
a) x x 4 = 36 b) 70 : x = 7
x = 36 : 4 x = 70 : 7
x = 9 x = 10
Đề bài :
\(\left(x-2\right)\left(x-4\right)\left(x+6\right)\left(x+8\right)=-36\)
\(x=+_-\sqrt{34}-2,\)
\(x=-3\sqrt{2}-2,\)
\(x=3\sqrt{2}-2\)
\(\left(x-1\right)\left(x-4\right)\left(x-5\right)\left(x-8\right)+36=0\)
\(\left[\left(x-1\right)\left(x-8\right)\right]\left[\left(x-4\right)\left(x-5\right)\right]+36=0\)
\(\left(x^2-9x+8\right)\left(x^2-9x+20\right)+36=0\)
Đặt \(a=x^2-9x+14\)ta có :
\(\left(a-6\right)\left(a+6\right)+36=0\)
\(a^2-6^2+36=0\)
\(a^2=0\)
Thay \(a=x^2-9x+14\)ta có :
\(\left(x^2-9x+14\right)^2=0\)
\(\Leftrightarrow x^2-9x+14=0\)
\(\Leftrightarrow x^2-2x-7x+14=0\)
\(\Leftrightarrow x\left(x-2\right)-7\left(x-2\right)=0\)
\(\Leftrightarrow\left(x-2\right)\left(x-7\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-2=0\\x-7=0\end{cases}\Rightarrow\orbr{\begin{cases}x=2\\x=7\end{cases}}}\)
Vậy,...........
\(x^3-4x^2-9x+36=0\)
\(x^2\left(x-4\right)-9\left(x-4\right)=0\)
\(\left(x-4\right)\left(x^2-9\right)=0\)\(\)
\(\Rightarrow x-4=0\) hay \(x^2-9=0\)
\(\Rightarrow x=4\) hay \(x^2=9=3^2\)
\(\Rightarrow x=4\) hay \(x=\pm3\)
⇔x2(x-4) -9(x-4) = 0
⇔(x-4).(x-3).(x+3) = 0
\(\Leftrightarrow\left[{}\begin{matrix}x-4=0\\x-3=0\\x+3=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=4\\x=3\\x=-3\end{matrix}\right.\)
Lớp 4?
a) \(\dfrac{x+1}{4}=\dfrac{36}{x+1}\)
\(\Rightarrow\left(x+1\right)^2=144\)
\(\Rightarrow\left[{}\begin{matrix}x+1=12\\x+1=-12\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=11\\x=-13\end{matrix}\right.\)
Vậy: \(x\in\left\{11;-13\right\}\)
b) \(\dfrac{x}{7}=\dfrac{55x-4}{28}\)
\(\Rightarrow4x=55x-4\)
\(\Rightarrow-51x=-4\)
\(\Rightarrow x=\dfrac{4}{51}\)
Vậy: \(x=\dfrac{4}{51}\)
a) \(\dfrac{x + 1}{4} = \dfrac{36}{x + 1} \)
\(\Rightarrow\) \(( x + 1 )( x + 1 ) = 36 . 4 \)
\(\Rightarrow ( x + 1 )^2 = 144 \)
\(\Rightarrow ( x + 1 )^2 = 12^2 = ( -12 )^2 \)
\(\Rightarrow\) \(x + 1 ∈ \) { \(12 ; -12 \) }
\(\Rightarrow \) \(x \) \(∈ \) { \(11 ; -13 \) }
Vậy \(x ∈ \) { \(11 ; -13 \) }
ngu thế
x=4+36
x=40