2 8/9 : 1 4/9 = 26/9 : 13/9 = 26/9 · 9/13 = 26/13 = 2
2 - 4/6 = 2 - 2/3 = 1 3/3 - 2/3 = 1 1/3
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(2 8/9 : 1 4/9 - 4/6) · х = 1
1 1/3 · х = 1
4/3 · х = 1
х = 1 : 4/3
х = 1 · 3/4
х = 3/4
ответ: 3/4 (или 0,75 в десятичных дробях).
