Question

спростіть вираз -3(1.2х-2)-(3-4.6х)+6(0.2х-1) якщо х = -15/22

Answer 1

$-3\left(1.2x-2\right)-\left(3-4.6x\right)+6\left(0.2x-1\right)=\\=-3.6x+6-3+4.6x+1.2x-6=\\=2.2x-3\\\\x=-\frac{13}{22} \\\\2\frac{2}{10}x-3 = \frac{x}{y} =\frac{22}{10}\cdot(-\frac{15}{22})-3= \\= -\frac{15}{10}=-1,5-3=-4,5$