1) 7 + 5 – 6 = _6_
7+5=12
12-6= 6

2) 9 + 7 ** (8 – 36) / 5 = _9_

9 +7**(-28)/5
9+2.17398/5
9+4.34795= 9

3) 7 * 5 ** 3 / 4 div 3 = _72.91_

7*125/4 div 3
875/4 div 3
218.75 div 3 = 72.91

4) 7 * 8 (160 mod 3 ** 3) div 5 * 13 – 28 _3612_


7*8 (160 mod 27) div 5 * 13 - 28
7*8 (25) div 5 * 13 - 28
7* 200 div 5 * 13 - 28
7*40*13-28
3640-28 = 3612


5) 15 / 2 * (68 – 15 * 33 + (45 ** 2 / 16) / 3) / 15) + 19 _19.29_
15 / 2 * (68 – 15 * 33 + (2025 / 16) / 3) / 15) + 19
15 / 2 * (68 – 15 * 33 + (126.56) / 3) / 15) + 19
15 / 2 * (68 – 15 * 33 + (42.18) / 15) + 19
15 / 2 * (68 – 495 + (42.18) / 15) + 19
15 / 2 * (-427 + 42.18)/ 15) + 19
15 / 2 * (-384.82 / 15 ) + 19
15/ 2 * 25.65 + 19
15/ 51.30 + 19
0.29 + 19 = 19.29

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