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B=\(\left(x^{2007}+3x^{2006}-1\right)^{2007}\)
\(B=\left[\left(-3^{2007}\right)+3\left(-3^{2006}\right)-1\right]^{2007}\)
\(B=\left[\left(-3^{2007}\right)+3.3^{2006}-1\right]^{2007}\)
\(B=\left[\left(-3^{2007}\right)+3^{2007}-1\right]^{2007}\)
\(B=\left(-1\right)^{2007}=\left(-1\right)\)
Ta có: \(B=\left(x^{2007}+3x^{2006}-1\right)^{2007}\)
Thay x = -3 vào B ta có:
\(B=\left(\left(-3\right)^{2007}+3\left(-3\right)^{2006}-1\right)^{2007}\)
=>\(B=\left(\left(-3\right)^{2007}+3\cdot3^{2006}-1\right)^{2007}\)
=>\(B=\left(\left(-3\right)^{2007}+3^{2007}-1\right)^{2007}\)
=>\(B=\left(0-1\right)^{2007}\)
\(=>B=\left(-1\right)^{2007}=-1\)
a) \(A=x^{15}+3x^{14}+5\)
\(=x^{14}\left(x+3\right)+5\)
\(=x^{14}.0+5\)
= 5
b) x = -3 => x + 3 = 0
\(B=\left(x^{2007}+3x^{2006}+1\right)^{2007}\)
\(=\left[x^{2006}\left(x+3\right)+1\right]^{2007}\)
\(=\left(x^{2006}.0+1\right)^{2007}\)
\(=1^{2007}=1\)
\(A=x^{15}+3.x^{14}+5\text{ biết x+3=0}\)
\(A=x^{14}.\left(x+3\right)+5\)
\(\text{Do x+3=0}\Rightarrow A=x^{14}.0+5\)
\(A=0+5\)
\(A=5\) \(\text{Vậy }A=5\text{ với x+3=0}\)
\(B=\left(x^{2007}+3.x^{2006}+1\right)^{2007}\text{ biết x=-3}\)
\(B=\left[x^{2006}.\left(x+3\right)+1\right]^{2007}\)
\(\text{Do x=-3}\Rightarrow B=\left[x^{2006}.\left(-3+3\right)+1\right]^{2007}\)
\(B=\left(x^{2006}.0+1\right)^{2007}\)
\(B=\left(0+1\right)^{2007}\)
\(B=1^{2007}\)
\(B=1\) \(\text{Vậy }B=1\text{ với x=-3}\)
Tại x= - 3
=> \(B=\left[\left(-3\right)^{2017}+3\left(-3\right)^{2016}-1\right]^{2017}\)
=> \(B=\left[\left(-3\right)^{2017}+3^{2017}-1\right]^{2017}\)
=> \(B=\left(-1\right)^{2017}\)
=> B = - 1
Ta có:
\(B=\left(x^{2007}+3x^{2006}-1\right)^{2007}\)
\(B=\left(\left(-3\right)^{2007}+3\left(-3\right)^{2006}-1\right)^{2007}\)
\(B=\left(\left(-3\right)^{2007}+3\left(3\right)^{2006}-1\right)^{2007}\)
\(B=\left(\left(-3\right)^{2007}+3^1\left(3\right)^{2006}-1\right)^{2007}\)
\(B=\left(\left(-3\right)^{2007}+3^{1+2006}-1\right)^{2007}\)
\(B=\left(\left(-3\right)^{2007}+3^{2007}-1\right)^{2007}\)
\(B=\left(0-1\right)^{2007}\)
\(B=\left(-1\right)^{2007}\)
\(B=1\)
Khi x=-3 thì biểu thức:
\(\Rightarrow B=\left(-3^{2007}+3.\left(-3\right)^{2006}-1\right)^{2007}\)
\(\Rightarrow B=.............\)
máy tính tính cũng không ra nha bạn
Thay \(x=-3\) vào biểu thức B ta được :
\(B=\left(-3^{2007}+3.\left(-3\right)^{2006}-1\right)^{2007}\)
\(=\left(-3^{2007}+3^{2007}-1\right)^{2007}\)
\(=-1^{2007}\)
\(=-1\)
Tại \(x=-3\) thì:
\(B=\left[-3^{2007}+3.\left(-3\right)^{2006}-1\right]^{2007}\)
\(\Rightarrow B=\left[-3^{2006}\left(-1+3\right)-1\right]^{2007}\)
\(\Rightarrow B=\left[-3^{2006}.2-1\right]^{2007}\)
Ta có:B=\(\left(x^{2007}+3x^{2006}-1\right)^{2007}\)
\(\Rightarrow\)B=\(\left(\left(-3\right)^{2007}+3\times\left(-3\right)^{2006}-1\right)^{2007}\)
B=\(\left(\left(-3\right)\times\left(-3\right)^{2006}+3\times\left(-3\right)^{2006}-1\right)^{2007}\)
B=\(\left(\left(\left(-3\right)+3\right)\times\left(-3\right)^{2006}-1\right)^{2007}\)
B=\(\left(0\times\left(-3\right)^{2006}-1\right)^{2007}\)
B=\(\left(0-1\right)^{2007}\)
B=\(\left(-1\right)^{2007}\)
B=\(\left(-1\right)\)