Вправи для повторення за рік » 941 (е-є)
е) 1/2х + 1/3х + 3/4х = 14/15; 6/12х + 4/12х + 9/12х = 19/15; 19/12х = 19/15; х = 19/15 : 12/19; х = 12/15. є) 1/7(7х + 14) – 21/3 = 12/3; х + 2 = 12/3 + 21/3; х + 2 = 4; х = 2.
е) 1/2х + 1/3х + 3/4х = 14/15; 6/12х + 4/12х + 9/12х = 19/15; 19/12х = 19/15; х = 19/15 : 12/19; х = 12/15. є) 1/7(7х + 14) – 21/3 = 12/3; х + 2 = 12/3 + 21/3; х + 2 = 4; х = 2.