Х+1/4=5/12, 2/5÷х=2 целых 1/5
X + 1/4 = 5/12 X = 5/12 - 3/12 X = 2/12 X = 1/6 ----------- 2/5 : x = 2 1/5 X = 2/5 : 11/5 X = 2/11