4 1/2 + 2/3 * 3 6/7 - 5 3/4 = 1 9/28
выражением:
= 4 2/4 + 2/3 * 27/7 - 5 3/4=
= 18/7 - 1 1/4 =
= 2 4/7 - 1 1/4 =
= 2 16/28 - 1 7/28 =
= 1 9/28
по действиям:
1) 2/3 * 3 6/7 = 2/3 * 27/7 = (2*9)/(1*7) = 18/7= 2 4/7
2) 4 1/2 + 2 4/7 = 4 7/14 + 2 8/14 = 6 + 15/14 =
= 6 + 1 1/14 = 7 1/14
3) 7 1/14 - 5 3/4 = 7 2/28 - 5 21/28 = 1 9/28