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Câu 2:
\(A\left(x\right)=x^2+3x+1\)
\(B\left(x\right)=2x^2-2x-3\)
a) Tính A(x) là sao em?
b) \(A\left(x\right)+B\left(x\right)=\left(x^2+3x+1\right)+\left(2x^2-2x-3\right)\)
\(=x^2+3x+1+2x^2-2x-3\)
\(=\left(x^2+2x^2\right)+\left(3x-2x\right)+\left(1-3\right)\)
\(=3x^2+x-2\)
Câu 1:
\(M\left(x\right)=x^3+3x-2x-x^3+2\)
\(=\left(x^3-x^3\right)+\left(3x-2x\right)+2\)
\(=x+2\)
Bậc của M(x) là 1
\(5-\left|3x-1\right|=3\)
\(\left|3x-1\right|=2\)
\(\Rightarrow\orbr{\begin{cases}3x-1=2\\3x-1=-2\end{cases}}\Rightarrow\orbr{\begin{cases}3x=3\\3x=-1\end{cases}}\Rightarrow\orbr{\begin{cases}x=1\\x=\frac{-1}{3}\end{cases}}\)
vậy \(\orbr{\begin{cases}x=1\\x=\frac{-1}{3}\end{cases}}\)
\(\left|x+\frac{3}{4}\right|-5=-2\)
\(\left|x+\frac{3}{4}\right|=3\)
\(\Rightarrow\orbr{\begin{cases}x+\frac{3}{4}=3\\x+\frac{3}{4}=-3\end{cases}}\Rightarrow\orbr{\begin{cases}x=\frac{9}{4}\\x=-\frac{15}{4}\end{cases}}\)
\(\left(1-2x\right)^2=9\)
\(\left(1-2x\right)^2=3^2\)
\(\Rightarrow1-2x=3\)
\(\Rightarrow2x=-2\)
\(\Rightarrow x=-1\)
vậy \(x=-1\)
\(\left(x+5\right)^3=-64\)
\(\left(x+5\right)^3=\left(-4\right)^3\)
\(\Rightarrow x+5=-4\)
\(\Rightarrow x=-9\)
vậy \(x=-9\)
\(\left(2x+1\right)^2=\frac{4}{9}\)
\(\left(2x+1\right)^2=\left(\frac{2}{3}\right)^2\)
\(\Rightarrow2x+1=\frac{2}{3}\)
\(\Rightarrow2x=\frac{-1}{3}\)
\(\Rightarrow x=\frac{-1}{6}\)
vậy \(x=-\frac{1}{6}\)
a, |x^2 - 3x| = 0
=> x^2 - 3x = 0
=> x(x - 3) = 0
=> x = 0 hoặc x - 3 = 0
=> x = 0 hoặc x = 3
vậy_
\(\left|a^2-3a\right|=0\)
\(\Rightarrow a^2-3a=0\)
\(\Rightarrow a\left(a-3\right)=0\)
\(\Rightarrow\hept{\begin{cases}a=0\\a=3\end{cases}}\)
a, x=-505
b, x=35/8 hoac -37/8
nhung cau con lai thi tong tu
b) (5/2-3x)=25/9
3x = 5/2-25/9
3x =-5/18
x =-5/18:3
x=-5/54
\(e.\left(x-1\right)^5=-32\)
\(\left(x-1\right)^5=\left(-2\right)^5\)
\(x-1=-2\)
\(x\) \(=-2+1\)
\(x\) \(=-1\)
Vậy \(x=-1\)
b) \(\left|2x-5\right|\)= x+1
\(\Rightarrow\) 2x-5 = x+1
\(\Rightarrow\) 2x-x=1+5
\(\Rightarrow\) x = 6
c) \(\left|3x-2\right|\)-1= x
\(\Rightarrow\) 3x-2-1= x
\(\Rightarrow\)3x-x =2+1
\(\Rightarrow\)2x =3
\(\Rightarrow\) x =\(\dfrac{3}{2}\)=1,5
e) \(\left|7-2x\right|\)+7 = 2x
\(\Rightarrow\)7-2x+7 =2x
\(\Rightarrow\) -2x -2x = -7-7
\(\Rightarrow\) -4x = -14
\(\Rightarrow\) x=\(\dfrac{14}{4}\)=\(\dfrac{7}{2}\)
2 nhân 1 hả e cái đầu á