( 4/7 - 1/3 + 5/6) * 42

можно по действиям

24-14+35)/42)*42=45. .........

(4/7 - 1/3 + 5/6) * 42 = 451) 4/7 - 1/3 = 12/21 - 7/21 = 5/212) 5/21 + 5/6 = 10/42 + 35/42 = 45/423) 45/42 * 42 = 45Пояснения:4/7 = (4*3)/(7*3) = 12/211/3 = (1*7)/(3*7) = 7/215/21 = (5*2)/(21*2) = 10/425/6 = (5*7)/(6*7) = 35/42