Question

rezolvati in multirile numerelor rationale ecuatiilor :2×(×+7)=3×(4-×)-8;2+3×(×+4)=×+5×(×-5);​

Answer 1

Raspuns:

$2 \times (x + 7) = 3 \times (4 - x)$

$2 x + 14 = 12 - 3x - 8$

$2x + 14 = 4 - 3x$

$2x + 3x = 4 - 14$

$5x = - 10$

$x = - 2$

$2 + 3 \times (x + 4) = x + 5 \times (x - 5)$

$2 + 3x + 12 = x + 5x - 25$

$14 + 3x = 6x - 25$

$3x - 6x = - 25 - 14$

$- 3x = - 39$

$x = 13$

Explicație pas cu pas: