Question

a) 520 + (218 - x) =720

 

b) x^30 = x

Answer 1

a) 18

b) 0

Answer 2

a, 520+(218-x)=720

=>  218-x=200

=> x=18

Vậy x=18

b, x³⁰  =x

=> x³⁰-x=0

=>x(x²⁹-1)=0

\(\Rightarrow\hept{\begin{cases}x=0\\x^{29}-1=0\end{cases}\Rightarrow\hept{\begin{cases}x=0\\x^{29}=1\end{cases}}}\)\(\Rightarrow\hept{\begin{cases}x=0\\x=1\end{cases}}\)

Vậy x=0 hoặc x=1

Answer 3

a) 520 + (218 - x) = 720

218 - x = 720 - 520

218 - x = 200

x = 218 - 200

x = 18

Đúng tk cho mk nha

Answer 4

b) chịu

Answer 5

a) 520+(218-x)=720

-> 218-x=200

->x=18

~Hok tốt~

Answer 6

a/  \(520+\left(218-x\right)=720\)

\(218-x=720-520\)

\(218-x=200\)

\(x=218-200\)

\(x=18\)

Vậy \(x=18\)

b/  \(x^{30}=x\)

\(x^{30}-x=0\)

\(x\times\left(x^{29}-1\right)=0\)

\(\Rightarrow[\frac{x=0}{x^{29}-1=0}\Rightarrow[\frac{x=0}{x^{29}=1}\Rightarrow[\frac{x=0}{x=1}\)

\(\Rightarrow x=\left\{0;1\right\}\)

Vậy \(x=\left\{0;1\right\}\)

Answer 7

a) 520+(218-x)=720

-> 218-x=200

->x=18

~Hok tốt~

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