45 − 15 * 6 : 18;
8 + 28 : 7 * 16;
25 * 3 − 15 * 4;
56 + 4 * 8 − 20;
(67 − 20) * 3;
(72 − 30) : 6;
7 * (9 + 5);
15 * (14 − 9);
0 * 27;
0 : 27;
0 + 27;
27 − 0.
45 − 15 * 6 : 18 = 45 − (10 + 5) * 6 : 18 = 45 − (10 * 6 + 5 * 6) : 18 = 45 − (60 + 30) : 18 = 45 − 90 : 18 = 45 − 5 = 40
8 + 28 : 7 * 16 = 8 + 4 * 16 = 8 + 4 * (10 + 6) = 8 + (4 * 10 + 4 * 6) = 8 + (40 + 24) = 8 + 64 = 72
25 * 3 − 15 * 4 = (20 + 5) * 3 − (10 + 5) * 4 = (20 * 3 + 5 * 3) − (10 * 4 + 5 * 4) = (60 + 15) − (40 + 20) = 75 − 60 = 15
56 + 4 * 8 − 20 = 56 + 32 − 20 = 88 − 20 = 68
(67 − 20) * 3 = 47 * 3 = (40 + 7) * 3 = 40 * 3 + 7 * 3 = 120 + 21 = 141
(72 − 30) : 6 = 42 : 6 = 7
7 * (9 + 5) = 7 * 9 + 7 * 5 = 63 + 35 = 98
15 * (14 − 9) = 15 * 5 = (10 + 5) * 5 = 10 * 5 + 5 * 5 = 50 + 25 = 75
0 * 27 = 0
0 : 27 = 0
0 + 27 = 27
27 − 0 = 27
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