N1 А) 3/5 : 1/4 = 3/5 * 4/1 = 12/5 = 2целых 2/5
б) 2 1/5 : 3 2/5 = 11/5 : 17/5 = 11/5 * 5/17 = 11/17
N2 3/5X=2/11
5х=3*11:2
х=33:10=3,3N3 (7/6 +(1/2)² +1 1/4) : 2 2/3 = 1
1) (1/2)² = 1/2 * 1/2 = 1/4
2) 7/6 + 1/4 = 28/24 + 6/24 = 34/24 = 17/12 =1 ЦЕЛАЯ 5/12
3) 1 5/12 + 1 1/4 = 1 5/12 + 1 3/12 = 2 8/12 = 2 2/3
4) 2 2/3 : 2 2/3 = 1
N4 (1,1x2,5:0,25-1,5):(8x2\5+6,3)=(9,5):(9,5)=1
N5 извини не понимаю \
N6 345999-34500=999 999 билетов