РОЗДІЛ 2. Раціональні вирази - Вправи 50 - 200 » 146

146. Спростіть вираз: 1) 5/(5+ x) + x/(5+ x) = (5+ x)/(5+ x) = 1; 2) 10/(5- x) – 2x/(5- x) = (10-2x)/(5- x) = (2(5- x))/(5- x) = 2; 3) 11/(6+ c) + (1+2c)/(6+ c) = (11+1+2c)/(6+ c) = (12+2c)/(6+ c) = (2(6+ c))/(6+ c) = 2; 4) (-2x)/(x-2) + (x+2)/(x-2) = (-2x+ x+2)/(x-2) = (-x+2)/(x-2) = (-(x-2))/(x-2) = –1; 5) 3y/(y+1) + (1-2y)/(y+1) = (3y+1-2y)/(y+1) = (y+1)/(y+1) = 1; 6) 4c/(c-1) + (1-5c)/(c-1) = (4c+1-5c)/(c-1) = (1- c)/(c-1) = (-(c-1))/(c-1) = +1.