`x^8+36x^4=0`

`<=>x^4(x^4+36)=0`

\(\Leftrightarrow\left[{}\begin{matrix}x^4=0\\x^4+36=0\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=0\\x^4=-36\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=0\\x\in\varnothing\end{matrix}\right.\)

__

`(x-5)^3 -x+5=0`

`<=> (x-5)^3 -(x-5)=0`

`<=> (x-5) [(x-5)^2 -1]=0`

`<=> (x-5)(x-5-1)(x-5+1)=0`

`<=>(x-5)(x-6)(x-4)=0`

\(\Leftrightarrow\left[{}\begin{matrix}x-5=0\\x-6=0\\x-4=0\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=5\\x=6\\x=4\end{matrix}\right.\)

__

`5(x-2)-x^2+4=0`

`<=>5(x-2)-(x^2-4)=0`

`<=>5(x-2)-(x-2)(x+2)=0`

`<=>(x-2)(5-x-2)=0`

`<=>(x-2)(-x-3)=0`

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

\(\left|x\right|=1+2+3+...+2010\)

\(\left|x\right|=\frac{\left(2010+1\right).2010}{2}\)

\(\left|x\right|=2011.1005\)

\(\left|x\right|=2021055\)

\(x=\pm2021055\)

\(2^x=2+4+6+...+2010\)

\(2^x=\frac{\left(2010+2\right).1005}{2}\)

\(2^x=1006.1005\)

\(x=\frac{log\left(1011030\right)}{log\left(2\right)}\)(Nguồn: wolframalpha)

\(697\div15a+\frac{364}{a}=17\)

\(\frac{697}{15a}+\frac{5460}{15a}=17\)

\(6157=17.15a\)

\(6197=255a\)

\(a=\frac{6197}{255}\)

(12000+X):376=X

12000+X=376 x X

12000=376 x X - X

12000=375 x X

X=12000:375= 32

3^x + 4² = 19⁶ : ( 19³ . 19² ) - 3 . 1²⁰¹⁸

3^x + 4² = 19⁶ : 19⁵ - 3 . 1

3^x + 4² = 19 - 3

3^x + 4² = 17

3^x + 16 = 17

3^x = 17 - 16

3^x = 1

\(\Rightarrow\) x = 0.

328 x 7 + 328 x 2 + 328

= 328 x ( 7 + 2 + 1 )

= 328 x 10

= 3280

328.7+328.2+328

=328.(7+2+1)

=328.10

=3280

 K choPark Bo gum

328 x 7 + 328 x 2 + 328

= 328 x ( 7 + 2 ) + 328

= 328 x 9 + 328

= 328 x 9 + 328 x 1

= 328 x 10

= 3280

Nếu mình đúng thì các bạn k mình nhé