( 16 - 8 : 0,5 ) x 177 = ( 16 - 16 ) x 177 = 0 x 177 = 0

199 x 2001  = 398199

Mk đầu tiên nha

Tính bằng máy tính là đc . ^_^

Máy tính đâu?

tk đi rồi mình làm cho

Giúp mình đi

\(=\dfrac{19}{8}.\dfrac{16}{9}+\dfrac{19}{8}.\dfrac{2}{9}-\dfrac{19}{8}.1=\dfrac{19}{8}.\left(\dfrac{16}{9}+\dfrac{2}{9}-1\right)\)

\(=\dfrac{19}{8}.1=\dfrac{19}{8}\)

\(\dfrac{19}{8}\times\dfrac{16}{9}+\dfrac{19}{8}\times\dfrac{2}{9}-\dfrac{19}{8}\)

\(=\dfrac{19}{8}\times\left(\dfrac{16}{9}+\dfrac{2}{9}-1\right)\)

\(=\dfrac{19}{8}\times1\)

\(=\dfrac{19}{8}\)

Dễ thấy 2001=2000+1=x+1,thay vào C ta có:

\(C=x^{20}-\left(x+1\right)x^{19}+\left(x+1\right)x^{18}-\left(x+1\right)x^{17}+...-\left(x+1\right)x^3+\left(x+1\right)x^2\)

\(=x^{20}-x^{20}-x^{19}+x^{19}+x^{18}-x^{18}-x^{17}+...-x^4-x^3+x^3+x^2=x^2=2001^2=4004001\)

Vậy C=4004001

x = \(\frac{48}{31}\)

31/48

\(\frac{8}{3}\)* x-3=0,5-\(\frac{16}{9}\)

\(\frac{8}{3}\)*x-3=\(\frac{23}{19}\)

\(\frac{8}{3}\)*x=\(\frac{23}{19}\)-3

\(\frac{8}{3}\)*x=\(\frac{-34}{19}\)

x=\(\frac{-34}{19}\):\(\frac{8}{3}\)

x=\(\frac{-51}{76}\)

k mình nhé