Найдите неизвестный член пропорции ПОЖАЛУЙСТА!! x:20=2:5 x:18=2:3 5:9=15:× x:18=7:9 6:x=3:7 12:7=60:x
X/20 = 2/5 5x = 40 x = 8 x/18 = 2/3 3x = 36 x = 12 5/9 = 15/x 5x = 135 x = 27 x/18 = 7/9 9x = 126 x = 14 6/x = 3/7 3x = 42 x = 14 12/7 = 60/x 12x = 420 x = 35