1) 4 х 9 - 4 = 32
8 х 9 - 4 = 68
7 х 9 - 4 = 59
6 х 9 - 4 = 50
9 х 9 - 4 = 73
11 х 9 - 4 = 95
2) 5 + 4 = 9 : 9 = 1
14 + 4 = 18 : 9 = 2
23 + 4 = 27 : 9 = 3
41 + 4 = 45 : 9 = 5
86 + 4 = 90 : 9 = 10
1) 44820:60= 747
269100:900= 299
72800:700= 104
2) 18720:(300-2920)= 18720:80= 234
25 × 25 - (9 × 25) : (3 × 50) = 625 - (225 : 150) = 625 - 1,5 = 623,5