Bài 2:
\(41-2^x-1=9\)
\(\Rightarrow40-2^x=9\)
\(\Rightarrow2^x=31\)
\(\Rightarrow x\in\left\{\varnothing\right\}\)
Vậy không có giá trị x thỏa mãn
b) \(\left|x-3\right|-21=-5\)
\(\Rightarrow\left|x-3\right|=16\)
\(\Rightarrow x-3=\pm16\)
+) \(x-3=16\Rightarrow x=19\)
+) \(x-3=-16\Rightarrow x=-13\)
Vậy \(x\in\left\{19;-13\right\}\)
d) Ta có: \(M=7+7^2+...+7^{2016}\)
\(\Rightarrow7M=7^2+7^3+...+7^{2017}\)
\(\Rightarrow7M-M=\left(7^2+7^3+...+7^{2017}\right)-\left(7+7^2+...+7^{2016}\right)\)
\(\Rightarrow6M=7^{2017}-7\)
\(6M+7=7^{x+1}\)
\(\Rightarrow7^{2017}-7+7=7^{x-1}\)
\(\Rightarrow7^{x-1}=7^{2017}\)
\(\Rightarrow x-1=2017\)
\(\Rightarrow x=2018\)
Vậy \(x=2018\)
g) Ta có: \(x+9⋮x-2\)
\(\Rightarrow\left(x-2\right)+11⋮x-2\)
\(\Rightarrow11⋮x-2\)
\(\Rightarrow x-2\in\left\{1;-1;11;-11\right\}\)
+) \(x-2=1\Rightarrow x=3\)
+) \(x-2=-1\Rightarrow x=1\)
+) \(x-2=11\Rightarrow x=13\)
+) \(x-2=-11\Rightarrow x=-9\)
Vậy \(x\in\left\{3;1;13;-9\right\}\)
Bài 3:
a) \(\left(x+1\right)^{100}+\left|y-3\right|=0\)
\(\Rightarrow\left(x+1\right)^{100}=0\) và \(\left|y-3\right|=0\)
+) \(\left(x+1\right)^{100}=0\Rightarrow x+1=0\Rightarrow x=-1\)
+) \(\left|y-3\right|=0\Rightarrow y-3=0\Rightarrow y=3\)
Vậy \(x=-1;y=3\)
