3/4 : х + 2 2/5 = 4 1/2
3/4 : х = 4 1/2 - 2 2/5
3/4 : х = 4 5/10 - 2 4/10
3/4 : х = 2 1/10
х = 3/4 : 21/10
х = 3/4 · 10/21 = (1·5)/(2·7)
х = 5/14
ответ: х = 5/14.
3/4 : х + 2 2/5 = 4 1/2
3/4 : х = 4 1/2 - 2 2/5
3/4 : х = 4 5/10 - 2 4/10
3/4 : х = 2 1/10
х = 3/4 : 21/10
х = 3/4 · 10/21 = (1·5)/(2·7)
х = 5/14
ответ: х = 5/14.