140р-100%
161р-х%
140/161=100/х
Х=100•161/140
Решайте
((2 1/3 - 1 7/9) : 30/49) + 11 5/6 = 12 целых 20/27
1) 2 1/3 - 1 7/9 = 2 3/9 - 1 7/9 = 1 12/9 - 1 7/9 = 5/9
2) 5/9 : 30/49 = 5/9 · 49/30 + (1·49)/(9·6) = 49/54
3) 49/54 + 11 5/6 = 49/54 + 11 45/54 = 11 94/54 = 11 47/27 = 12 20/27