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\(a,\left(x+2\right)^{10}+\left(x+2\right)^8=0\\ \Leftrightarrow\left(x+2\right)^8\left[\left(x+2\right)^2+1\right]=0\\ \Leftrightarrow\left[{}\begin{matrix}\left(x+2\right)^8=0\\\left(x+2\right)^2+1=0\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x+2=0\\\left(x+2\right)^2=-1\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=-2\\x\in\varnothing\end{matrix}\right.\\ b,\left(x+3\right)^{10}-\left(x+3\right)^8=0\\ \Leftrightarrow\left(x+3\right)^8\left[\left(x+3\right)^2-1\right]=0\\ \Leftrightarrow\left[{}\begin{matrix}\left(x+3\right)^8=0\\\left(x+3\right)^2-1=0\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x+3=0\\\left(x+3\right)^2=1\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=-3\\x+3=1\\x+3=-1\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=-3\\x=-2\\x=-4\end{matrix}\right.\)
x.8+56+x.4-28=x.3+9+x+4*(1-3)
=>12x+(56-28)=(3x+x)+9+4*(-2)
=>12x+28=4x+9-8=4x+1
=>12x-4x=1-28
8x=-27
x=-27/8
(x+1)(x2-x+1)-x(x-3)(x+3)=8
x3+1-x(x2-9)=8
x3+1-x3-9x=8
(x3-x3)+(1-8)-9x=0
-7-9x=0
-9x=-7
x=7/9
a) => x - 8 = 0 hoặc x3 + 8 = 0
+) x - 8 = 0 => x = 8
+) x3 + 8 = 0 => x3 = - 8 = (-2)3 => x = -2
Vậy x = 8; -2
b) => 4x - 3 - x - 5 = 30 - 3x
=> 3x - 8 = 30 - 3x
=> 3x + 3x = 30 + 8
=> 6x = 38 => x = 38/6 = 19/3
Vậy x = 19/3
a) => x - 8 = 0 hoặc x3 + 8 = 0
+) x - 8 = 0 => x = 8
+) x3 + 8 = 0 => x3 = - 8 = (-2)3 => x = -2
Vậy x = 8; -2
b) => 4x - 3 - x - 5 = 30 - 3x
=> 3x - 8 = 30 - 3x
=> 3x + 3x = 30 + 8
=> 6x = 38 => x = 38/6 = 19/3
Vậy x = 19/3
\(2x+3=8\)
\(\Rightarrow2x=8-3\)
\(\Rightarrow2x=5\)
\(\Rightarrow x=5:2\)
\(\Rightarrow x=\dfrac{5}{2}\)
a) \(\dfrac{3}{5}:x=3\)
\(x=\dfrac{3}{5}:3\)
\(x=\dfrac{3}{5}\times\dfrac{1}{3}\)
\(x=\dfrac{1}{5}\)
b) \(\dfrac{x}{5}:\dfrac{3}{8}=\dfrac{8}{5}\)
\(\dfrac{x}{5}=\dfrac{8}{5}\times\dfrac{3}{8}\)
\(\dfrac{x}{5}=\dfrac{3}{5}\)
\(=>x=3\)
a)(x-8)(x3+8)=0
<=>x-8=0 hoặc x3+8=0
<=>x=8 hoặc x3=-8
<=>x=8 hoặc x=-2
b)(4x-3)-(x+5)=3(10-x)
<=>4x-3-x-5=30-3x
<=>(4x-x)+(-3-5)=30-3x
<=>3x-8=30-3x
<=>6x=38
<=>x=\(\frac{38}{6}=\frac{19}{3}\)
a) (x-8)(x^3+8)=0
=>x-8=0 hoặc x^3+8=0
x-8=0 x^3+8=0
x =0+8 x^3=0-8
x =0 x^3=-8
x^3=-2^3
x=-2
=>x=8 hoặc x= -2
a)(x-8)*(x^3+8)=0
nên x-8=0 hoặc x^3+8=0
x=0+8 x^3=0-8
x=8 hoặc x^3=-8
x=-2
vậy x=8 hoặc x=-2
b)(4x-3)-(x+5)=3(10-x)
4x-3-x-5=30-3x(quy tắc bỏ ngoặc)
3x-8=30-3x
3x+3x=30+8(chuyển vế)
6x=38
x=38:6
1: 7-x=8+(-7)
=>7-x=8-7=1
=>x=7-1=6
2: \(x-8=\left(-3\right)-8\)
=>x-8=-11
=>\(x=-11+8=-3\)
3: \(2-x=10-9+23\)
=>\(2-x=33-9=24\)
=>x=2-24=-22
4: \(-2-x=15\)
=>\(x=-2-15=-17\)
5: \(-7+x-8=-3-1+13\)
=>x-14=13-4=9
=>x=9+14=23
6: 100-x+7=-x+3
=>107-x=3-x
=>107=3(vô lý)
7: \(23+x=8-2x\)
=>\(x+2x=8-23\)
=>3x=-15
=>x=-15/3=-5
X x 3 - X = 8
X x 3 - X x 1 = 8
X x ( 3 - 1 ) = 8
X x 2 = 8
X = 8 : 2
X = 4
~ Em Hok Tốt nha ~
x x 3- x=8
x x(3-1)=8
x x2=8
x=8:2
x=4
Vậy x=4