РОЗДІЛ 2. Раціональні вирази - Вправи 50 - 200 » 139

139. Виконайте додавання дробів. 1) 2/5x + 7/5x = (2+7)/5x = 9/5x; 2) 8/3a + 2/3a = (8+2)/3a = 10/3a; 3) 1/6c + 7/6c = (1+7)/6c = 8/6c = 4/3c; 4) 2x/(x-2) + 3x/(x-2) = (2x+3x)/(x-2) = 5x/(x-2); 5) 3y/(y+1) + 2y/(y+1) = (3y+2y)/(y+1) = 5y/(y+1); 6) 4c/(c-1) + c/(c-1) = (4c+ c)/(c-1) = 5c/(c-1); 7) 3a/(x+2) + 4a/(x+2) = (3a+4a)/(x+2) = 7a/(x+2); 8) 4c/(y-1) + 7c/(y-1) = (4c+7c)/(y-1) = 11c/(y-1); 9) 3x/(c^2+1) + 8x/(c^2+1) = (3x+8x)/(c^2+1) = 11x/(c^2+1).