Question

Tìm x                                                                                                                                                     2^3 x + 5^2 x = 2 * ( 5^2 + 2^3 ) - 33                      15 : ( x + 2 ) = ( 3^3 + 3 ) : 10

Answer 1

\(2^3x+5^2x=2.\left(5^2+2^3\right)-33\)

\(8x+25x=2.\left(25+8\right)-33\)

\(8x+25x=2.33-33\)

\(8x+25x=66-33\)

\(8x+25x=33\)

\(x+\left(8+25\right)=33\)

\(x+33=33\)

\(x=0\)

Answer 2

\(15:\left(x+2\right)=\left(3^3+3\right):10\)

\(15:\left(x+2\right)=\left(27+3\right):10\)

\(15:\left(x+2\right)=30:10\)

\(15:\left(x+2\right)=3\)

\(x+2=15:3\)

\(x+2=5\)

\(x=3\)

Answer 3

Ta có: \(15:\left(x+2\right)=\left(3^3+3\right):10\)

\(\Leftrightarrow15:\left(x+2\right)=3\)

\(\Leftrightarrow x+2=5\)

hay x=3