Question

[ancutdi]

nhanh giúp mình với ạ mình cảm ơn

Answer 1

[Nguyễn Lê Phước Thịnh]

bài 2: 

a: Ta có: \(\left(x+5\right)^3=-64\)

\(\Leftrightarrow x+5=-4\)

hay x=-9

b: Ta có: \(\left(2x-3\right)^2=9\)

\(\Leftrightarrow\left[{}\begin{matrix}2x-3=3\\2x-3=-3\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}2x=6\\2x=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=3\\x=0\end{matrix}\right.\)

Answer 2

[Akai Haruma]

Bài 1:
a. 

\((2^3)^4-(2^6)^2=2^{3.4}-2^{6.2}=2^{12}-2^{12}=0\)

b.

\(32^5:8^3=(2^5)^5:(2^3)^3=2^{25}:2^9=2^{25-9}=2^{16}\)

c.

\(81^4.27^6=(3^4)^4.(3^3)^6=3^{16}.3^{18}=3^{16+18}=3^{34}\)

d.

\(x^{12}:(x^3)^4=x^{12}: x^{12}=1\)