Вправи для повторення розділу 1 » 32

Розв’яжи рівняння. 1) (х + 4/7) – 9/14 = 1/2; х + 4/7 = 1/2 + 9/14; х = 7/14 + 9/14 – 4/7; х = 16/14 – 8/14; х = 8/14 = 4/7; 2) 4/5 – (х + 2/45) = 1/3; х + 2/45 = 4/5 – 1/3; х = 4/5 – 1/3 – 2/45; х = (36 - 15 - 2)/45; х = 19/45; 3) 4/9 – (х – 17/18) = 1/27; х – 17/18 = 4/9 – 1/27; х = 4/9 – 1/27 + 17/18; х = (24 - 2 + 51)/54; х = 73/54 = 119/54; 4) 17/18 – (8/9 – х) = 5/6; 8/9 – х = 17/18 – 5/6; х = 8/9 – (17/18 – 5/6); х = (16 - (17 - 15))/18 х = 14/18 = 7/9;