7z-2z+4=5z+4 всё сделай или напиши
<span>вычислите:
</span>5/8 - 5/6 = 15/24 - 20/24 = - <span>5/24</span>
(5/8 - 5/6):(-15/16) = (-5/24)*(<span>-16/15) =(5*16)/(24*15) = 2/9</span>
5/8 + 5/6 = 15/24 + 20/24 = 35/24
(5/8 + 5/6):(7/8) = (35/24)*(8/7) =(35*8)/(24*7) = 5/3
<span> = </span>2/9 - 5/3 = 2/9 - 15/9 =(2-15)/9 =-13/9 = -1 4/9