Найдите значение выражения. 1) 1/18+2/7+5/18; 2) 1/4+3/8+2/4+1/8; 3)4/27+7/18+4/9+1/18+5/27

1/18+2/7+5/18=(1/18+5/18)+2/7=6/18+2/7=1/3+2/7=7/21+6/21=13/21 1/4+3/8+2/4+1/8=(1/4+2/4)+(3/8+1/8)=3/4+4/8=3/4+2/4=5/4=1 1/4 4/27+7/18+4/9+1/18+5/27=(4/27+5/27)+(7/18+1/18)+4/9=9/27+8/18+4/9= =3/9+4/9+4/9=11/9=1 2/9

1) (1/18 + 5/18) + 2/7 = 6/18 + 2/7 = 1/3 + 2/7 = 7/21 + 6/21 = 13/21 2) (1/4 + 2/4) + (3/8 + 1/8) = 3/4 + 4/8 = 3/4 +2/4 = 5/4 = 1 целая 1/4 30 (4/27 + 5/27) + (7/18 + 1/18) + 4/9 = 9/27 + 8/18 + 4/9 = 3/9 + 4/9 + 4/9 = = 11/9 = 1 целая 2/9