3x(12x-4)-9x(4x-3)=30 x(5-2x)+2x(x-1)=15 10/09/2021 Bởi Savannah 3x(12x-4)-9x(4x-3)=30 x(5-2x)+2x(x-1)=15
$3x(12x-4)-9x(4x-3)=30$ $⇔36x^2-12x-36x^2+27x=30$ $⇔15x=30$ $⇔x=2$ Vậy $S=\{2\}$ $x(5-2x)+2x(x-1)=15$ $⇔5x-2x^2+2x^2-2x=15$ $⇔3x=15$ $⇔x=5$ Vậy $S=\{5\}$ Bình luận
$3x(12x-4)-9x(4x-3)=30 \\⇔36x^2-12x-36x^2+27x=30 \\⇔15x=30 \\⇔x=2 \\Vậy\ x=2 \\x(5-2x)+2x(x-1)=15 \\⇔5x-2x^2+2x^2-2x=15 \\⇔3x=15 \\⇔x=5 \\Vậy\ x=5$ Bình luận
$3x(12x-4)-9x(4x-3)=30$
$⇔36x^2-12x-36x^2+27x=30$
$⇔15x=30$
$⇔x=2$
Vậy $S=\{2\}$
$x(5-2x)+2x(x-1)=15$
$⇔5x-2x^2+2x^2-2x=15$
$⇔3x=15$
$⇔x=5$
Vậy $S=\{5\}$
$3x(12x-4)-9x(4x-3)=30 \\⇔36x^2-12x-36x^2+27x=30 \\⇔15x=30 \\⇔x=2 \\Vậy\ x=2 \\x(5-2x)+2x(x-1)=15 \\⇔5x-2x^2+2x^2-2x=15 \\⇔3x=15 \\⇔x=5 \\Vậy\ x=5$