1 2 2 1 3 1 2
13 - 9 + 21 = 25 20 - 10 : 2 = 15 27-(12+15):3 = 18
1) 13 - 9 = 4 1) 10 : 2 = 5 1) 12 + 15 = 27
2) 4 + 21 = 25 2) 20 - 5 = 15 2) 27 : 3 = 9
--------------------- ---------------------- 3) 27 - 9 = 18
1 2 2 1 ------------------------
36 : 6 * 9 = 54 10 + 8 : 4 = 12 2 1 3
1) 36 : 6 = 6 1) 8 : 4 = 2 2*(13+7)+5 = 45
2) 6 * 9 = 54 2) 10 + 2 = 12 1) 13 + 7 = 20
--------------------- ---------------------- 2) 2 * 20 = 40
2 1 2 1 3) 40 + 5 = 45
25 - 5 * 3 = 10 10 + 20 : 4 = 15 ------------------------
1) 5 * 3 = 15 1) 20 : 4 = 5
2) 25 - 15 = 10 2) 10 + 5 = 15
---------------------- ----------------------