Верны ли равенства?
1) 2/3:4/5=10:12
2) 3/7:4/9=27:28
3) 4/11:5/6=48/110
4) 1/2:2/3=4:3

1) да2/3 : 4/5 = 2/3 * 5/4 = 5/610/12 = 5/65/6 = 5/62) да3/7 : 4/9 = 3/7 * 9/4 = 27/2827/28 = 27/283) да4/11 : 5/6 = 4/11 * 6/5 = 24/5548/110 = 24/5524/55 = 24/554) нет1/2 : 2/3 = 1/2 * 3/2 = 3/43/4 не= 4/3