+) -11-|25-x|=(-8).2
-11-|25-x|=-16
|25-x|=5
\(\Leftrightarrow\)\(\orbr{\begin{cases}25-x=5\\25-x=-5\end{cases}}\)\(\Leftrightarrow\)\(\orbr{\begin{cases}x=20\\x=30\end{cases}}\)
Vậy x \(\in\){20;30}
+) 3x2-53=-5
3x2=48
x2=16
x=\(\pm\)4
Vậy x=\(\pm\)4
+) 5x5+12=-148
5x5 = -160
x5= -32
x= -2
Vậy x= -2
+) 3.(-2)x -5 = -101
3.(-2)x = -96
(-2)x = -32
(-2)x= (-2)5
x=5
Vậy x=5
Chúc bạn học tốt
\(-11-\left|25-x\right|=\left(-8\right).2\)
\(\Rightarrow\left|25-x\right|=5\)
\(\Leftrightarrow\orbr{\begin{cases}25-x=5\\25-x=-5\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=20\\x=30\end{cases}}\)
\(3x^2-53=-5\)
\(\Rightarrow3x^2=48\)
\(\Rightarrow x^2=16\)
\(\Rightarrow x=\pm4\)
\(5x^5+12=-148\)
\(5x^5=-160\)
\(\Rightarrow x^5=-32\)
\(\Rightarrow x=-2\)
\(3\left(-2\right)^x-5=-101\)
\(\Rightarrow3.\left(-2\right)^x=-96\)
\(\Rightarrow\left(-2\right)^x=-32=\left(-2\right)^5\)
\(\Rightarrow x=5\)