81 : 9 + 26* 6- 144: 72 = 163
1) 81 : 9 = 9
2) 26 * 6 = 156
3) 144 : 72 = 2
4) 9 + 156 = 165
5) 165 - 2 = 163
-----------------------------------------
4 * 18 - 9 - 32 : 8 + 111 * 8 = 947
1) 4 * 18 = 72
2) 32 : 8 = 4
3) 111 * 8 = 888
4) 72 - 9 = 63
5) 63 - 4 = 59
6) 59 + 888 = 947
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(25 * 3 : 15) * (48 * 2 : 16) = 30
1) 25 * 3 = 75
2) 75 : 15 = 5
3) 48 * 2 = 96
4) 96 : 16 = 6
5) 5 * 6 = 30
-------------------------------
(12 * 7 : 42) * (16 * 6 : 24) = 8
1) 12 * 7 = 84
2) 84 : 42 = 2
3) 16 * 6 = 96
4) 96 : 24 = 4
5) 2 * 4 = 8