10x+2y=79 10x-5x=79 y=-2,5x 5x=79 x=79/5 x =15,8
A)<span>4, 2 * 10^2 кг*10^3 = 420000 гр
</span><span>б) 6,3*10^3 кг*10^3 = 6300000 гр
в)</span><span>3,6*10^-2 гр*10^-3 = 0,000036 кг</span>
(x^2 - 1)^2 + 6(x^2 -1) + 9 = 0
(x^2 - 1)(x - 1 + 6 + 9) = 0
(x^2 - 1)(x + 14) = 0