Question

реши уравнения: 1 2/7 + 2 1/3 х + 3/14 + х = 9

Answer 1

$1 frac{2}{7} +2 frac{1}{3}x+ frac{3}{14} +x=9 \ \ frac{9}{7} + frac{7x}{3}+ frac{3}{14}+x=9 \ \ frac{7x+3x}{3} = frac{9*14-3-9*2}{14} \ \ frac{10x}{3} = frac{105}{14} \ \ 140x=315 \ \ x=2,25$