a) \(x^{15}=x\)

\(\Leftrightarrow x\left(x^{14}-1\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x^{14}=1\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=1\\x=-1\end{matrix}\right.\)

b) \(\left(x-5\right)^6=\left(x-5\right)^4\)

\(\Leftrightarrow\left(x-5\right)^6-\left(x-5\right)^4=0\)

\(\Leftrightarrow\left(x-5\right)^4\left[\left(x-5\right)^2-1\right]=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x-5=0\\x-5=1\\x-5=-1\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=5\\x=6\\x=4\end{matrix}\right.\)

c) \(\left(2x-15\right)^5=\left(2x-15\right)^3\)

\(\Leftrightarrow\left(2x-15\right)^5-\left(2x-15\right)^3=0\)

\(\Leftrightarrow\left(2x-15\right)^3\left[\left(2x-15\right)^2-1\right]=0\)

\(\Leftrightarrow\left[{}\begin{matrix}2x-15=0\\2x-15=1\\2x-15=-1\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{15}{2}\\x=8\\x=7\end{matrix}\right.\)

câu c bạn zinyami ơi

x=240:8=30

x=240:8

x=30

a.(8^6.0):8^5

=0:8^5=0

b.40^4:40^3+4.3

=40+12=52

a. [ 8⁶.4320⁰ ] : 8⁵

= [ 8⁶.1] :8⁵

= 8⁶ : 8⁵

=8

b) (22+18)⁴ : 40³ + 2².3

= 40⁴ : 40³ + 2².3

= 40 + 2².3

= 40 + 4.3

=40 + 12

=52

trả lời nhanh giúp mình ạ

a) 58. 59 + 59. 43 - 59

= 59. ( 58 + 43 - 1 )

= 59. 100

= 5900

b) 3³. 22 - 3³. 19

= 3³. ( 22 - 19 )

= 27. 3

= 81

c) ( 9⁶. 57 + 43. 9⁶ ) : 9⁶

= 9⁶. ( 57 + 43 ) : 9⁶

= 9⁶. 100 : 9⁶

= 9⁶ : 9⁶ . 100

= 1. 100

= 100

d) 118. 45 + 55. 118 - 18. 100

= 118. ( 45 + 55 ) - 18. 100

= 118. 100 - 18. 100

= 100. ( 118 - 18 )

= 100. 100

= 10000