Question

tim so tu nhien x biet : 5x+7chia het cho 3x+2

Answer 1

\(\left(5x+7\right)⋮\left(3x+2\right)\)

\(3\left(5x+7\right)-5\left(3x+2\right)⋮\left(3x+2\right)\)

\(15x+21-15x-10⋮\left(3x+2\right)\)

\(11⋮\left(3x+2\right)\)

\(\left(3x+2\right)\inƯ\left(11\right)=\left\{1;11\right\}\)

Mà 3x + 2 > 0 nên 3x + 2 = 11

Vậy x = 3