9·4 = 3632:4 = 820:4 = 542+(20-8) = 548·4 = 3214:7 = 236:9 = 450-(17-9) = 427·4 = 2824:6 = 428:4 = 770-(38+7) = 25
9·4 = 36
32:4 = 8
20:4 = 5
42+(20-8) = 54
8·4 = 32
14:7 = 2
36:9 = 4
50-(17-9) = 42
7·4 = 28
24:6 = 4
28:4 = 7
70-(38+7) = 25