1. Let's solve arithmetic expressions from lines 15 to 39. 15. 20 \cdot 3 + 178 = 60 + 178 = 238 290 - 810 \div 9 = 290 - 90 = 200 (270 + 90) \div 6 = 360 \div 6 = 60 (976 - 346) \div 6 = 630 \div 6 = 105 40 \cdot 7 - 236 = 280 - 236 = 44 340 + 240 \div 8 = 340 + 30 = 370 (580 - 180) \div 5 = 400 \div 5 = 80 (795 - 725) \cdot 8 = 70 \cdot 8 = 560 633 - 24 \div 3 \cdot 2 = 633 - 8 \cdot 2 = 633 - 16 = 617 16. 560 - 420 \div 7 = 560 - 60 = 500 (360 - 280) \cdot 7 = 80 \cdot 7 = 560 56 - 4 \cdot 9 + 582 = 56 - 36 + 582 = 602 81 \div 9 + 203 - 176 = 9 + 203 - 176 = 36 342 + 6 \cdot 8 - 276 = 342 + 48 - 276 = 114 64 \div 8 + 437 - 209 = 8 + 437 - 209 = 236 17. 593 + 3 \cdot 7 - 384 = 593 + 21 - 384 = 230 24 \div 3 + 548 - 507 = 8 + 548 - 507 = 49 720 - 91 \div 7 \cdot 4 = 720 - 13 \cdot 4 = 720 - 52 = 668 60 \cdot 5 + 30 \cdot 7 - 384 = 300 + 210 - 384 = 126 522 - 80 \div 16 \cdot 14 = 522 - 5 \cdot 14 = 522 - 70 = 452 780 - 90 \div 10 \cdot 5 = 780 - 9 \cdot 5 = 780 - 45 = 735 18. (256 - 165) \cdot 7 = 91 \cdot 7 = 637 (324 - 268) \div 2 = 56 \div 2 = 28 (365 - 299) \div 6 = 66 \div 6 = 11 (837 - 765) \div 9 = 72 \div 9 = 8 (748 - 718) \div 6 = 30 \div 6 = 5 (800 - 725) \div 3 = 75 \div 3 = 25 19. 96 \div 3 + 488 - 256 = 32 + 488 - 256 = 264 70 \div 14 \cdot 19 + 280 = 5 \cdot 19 + 280 = 95 + 280 = 375 17 - 4 + 293 - 164 = 13 + 293 - 164 = 142 88 \div 11 \cdot 12 + 300 = 8 \cdot 12 + 300 = 96 + 300 = 396 90 \div 6 + 597 - 321 = 15 + 597 - 321 = 291 32 \cdot 2 \div 16 + 996 = 64 \div 16 + 996 = 4 + 996 = 1000 20. 756 - 27 \div 9 + 256 = 756 - 3 + 256 = 1009 837 - 96 \div 8 + 107 = 837 - 12 + 107 = 932 271 + 92 \div 23 - 198 = 271 + 4 - 198 = 77 900 - (36 + 64) \cdot 5 = 900 - 100 \cdot 5 = 900 - 500 = 400 91 \div 13 + 476 - 248 = 7 + 476 - 248 = 235 (257 - 197) \div 3 = 60 \div 3 = 20 21. (520 - 478) \div 7 = 42 \div 7 = 6 (634 - 598) \div 4 = 36 \div 4 = 9 (341 - 251) \div 9 = 90 \div 9 = 10 (762 - 678) \div 4 = 84 \div 4 = 21 (236 + 124) \div 4 = 360 \div 4 = 90 (430 + 170) \div 100 = 600 \div 100 = 6 22. 560 \div 7 - 320 \div 4 = 80 - 80 = 0 240 \div 3 + 572 = 80 + 572 = 652 810 \div 9 + 487 = 90 + 487 = 577 420 \div 6 - 280 \div 7 = 70 - 40 = 30 721 - 360 \div 9 = 721 - 40 = 681 892 - 480 \div 8 = 892 - 60 = 832 810 \div 9 - 720 \div 8 = 90 - 90 = 0 836 - 540 \div 6 = 836 - 90 = 746 280 \div 4 + 669 = 70 + 669 = 739 23. 280 \div 4 + (348 - 162) = 70 + 186 = 256 60 \cdot 7 - (456 - 278) = 420 - 178 = 242 640 \div 8 + (837 - 654) = 80 + 183 = 263 65 \div 8 - (900 - 415) = 8.125 - 485 = -476.875 72 \div 24 + 762 - 447 = 3 + 315 = 318 68 \div 17 + 540 - 396 = 4 + 144 = 148 24. 3 \cdot 7 + 27 \div 9 = 21 + 3 = 24 (548 - 521) \div 3 = 27 \div 3 = 9 (472 + 88) \div 8 = 560 \div 8 = 70 3 \cdot 9 - 24 \div 3 = 27 - 8 = 19 (695 - 600) \cdot 10 = 95 \cdot 10 = 950 2 \cdot 8 + 18 \div 9 = 16 + 2 = 18 25. 100 - (67 + 28) + 5 = 100 - 95 + 5 = 10 (520 + 480) \div 1000 = 1000 \div 1000 = 1 200 - (360 - 240) + 30 = 200 - 120 + 30 = 110 600 \div (20 \cdot 5) \cdot 6 = 600 \div 100 \cdot 6 = 6 476 - (476 - 387) = 476 - 89 = 387 608 - (144 + 359) = 608 - 503 = 105 26. 4 \cdot 6 - 36 \div 4 = 24 - 9 = 15 5 \cdot 9 + 8 \cdot 5 = 45 + 40 = 85 36 \div 12 \cdot (88 \div 22) = 3 \cdot 4 = 12 4 \cdot 8 - 32 \div 8 = 32 - 4 = 28 7 \cdot 8 + 6 \cdot 7 = 56 + 42 = 98 56 \div 14 \cdot (66 \div 33) = 4 \cdot 2 = 8 5 \cdot 7 + 40 \div 8 = 35 + 5 = 40 96 + 7 \cdot 4 = 96 + 28 = 124 90 \div 18 \cdot 66 \div 22 = 5 \cdot 3 = 15 27. (865 + 70) - 165 = 935 - 165 = 770 (94 + 835) - 165 = 929 - 165 = 764 (872 - 472) \div 100 = 400 \div 100 = 4 (164 + 250) + 50 = 414 + 50 = 464 917 - (674 - 86) = 917 - 588 = 329 801 - (217 + 394) = 801 - 611 = 190 28. 436 - (197 + 163) = 436 - 360 = 76 (356 + 244) \div 10 = 600 \div 10 = 60 751 - (455 + 77) = 751 - 532 = 219 436 - 197 + 163 = 239 + 163 = 402 (456 + 144) - 104 = 600 - 104 = 496 600 + (425 - 387) = 600 + 38 = 638 29. (258 + 642) \div 3 = 900 \div 3 = 300 (912 - 112) \div 4 = 800 \div 4 = 200 840 \div 4 + 0 \cdot 3 = 210 + 0 = 210 18 \cdot 3 \div 2 \cdot 10 = 54 \div 2 \cdot 10 = 27 \cdot 10 = 270 (185 + 815) \div 5 = 1000 \div 5 = 200 (704 - 304) \div 8 = 400 \div 8 = 50 800 - 690 \div 3 \cdot 0 = 800 - 230 \cdot 0 = 800 36 \cdot 2 \div 9 \cdot 10 = 72 \div 9 \cdot 10 = 8 \cdot 10 = 80 (155 + 265) \div 7 = 420 \div 7 = 60 30. (900 - 540) \div 9 = 360 \div 9 = 40 450 \div 9 \cdot 7 - 350 \cdot 0 = 50 \cdot 7 - 0 = 350 45 \cdot 20 \div 10 = 900 \div 10 = 90 9580 - 1365 = 8215 75 \div 15 + 1000 \div 10 = 5 + 100 = 105 64073 + 126058 = 190131 31. 47632 + 71394 = 119026 37452 + 56397 = 93849 751 + (910 - 661) = 751 + 249 = 1000 23 \div 23 \div 18 = 1 \div 18 \approx 0.0556 9045 - 6020 = 3025 14768 - 1153 = 13615 85 \cdot 2 + 420 \div 6 = 170 + 70 = 240 30 \cdot 3 - 450 \div 9 = 90 - 50 = 40 75 \cdot 4 - 810 \div 9 = 300 - 90 = 210 32. 1000 - (170 - 130) - 200 = 1000 - 40 - 200 = 760 292874 + 15386 + 905 + 96 = 309261 2500 + (5100 - 3100) \cdot 2 = 2500 + 2000 \cdot 2 = 2500 + 4000 = 6500 33. 900 - (600 - 250) - 300 = 900 - 350 - 300 = 250 (300 + 700) - (200 + 50) = 1000 - 250 = 750 62004 - (46006 + 5309) = 62004 - 51315 = 10689 70368 + 482 + 3608 + 74 = 74532 740 - 300 - (196 - 96) = 740 - 300 - 100 = 340 1008 + (30026 + 24028) = 1008 + 54054 = 55062 34. 48062 - (42005 - 1708) = 48062 - 40297 = 7755 35000 - 999 \cdot 10 = 35000 - 9990 = 25010 (15496 + 7804) - 18697 = 23300 - 18697 = 4603 560 \cdot 100 - 449 \cdot 100 = 56000 - 44900 = 11100 (80057 - 843) \cdot 10 = 79214 \cdot 10 = 792140 575 \cdot 100 - 465 \cdot 100 = 57500 - 46500 = 11000 35. 200000 - 149900 \div 100 = 200000 - 1499 = 198501 6000 \div (49 + 51) + 500 = 6000 \div 100 + 500 = 60 + 500 = 560 (240 - 60) + (260 - 80) = 180 + 180 = 360 (760374 - 759814) \div 8 = 560 \div 8 = 70 20000 - 6751 + 1891 = 20000 - 4860 = 15140 8756 + 84295 + 37068 = 130119 36. 65695 + 35307 = 101002 (300 - 150) \cdot 6 = 150 \cdot 6 = 900 72 \div 9 \cdot (11 - 11) = 8 \cdot 0 = 0 (320 + 120) \div 4 = 440 \div 4 = 110 62 \div 31 \cdot (48 + 0) = 2 \cdot 48 = 96 (50 \cdot 4) + (60 \cdot 3) = 200 + 180 = 380 37. (615 + 170) - 115 = 785 - 115 = 670 (25408 + 8926) \cdot 10 = 34334 \cdot 10 = 343340 82075 + (70020 - 36485) = 82075 + 33535 = 115610 20000 - (6751 + 1891) = 20000 - 8642 = 11358 (300 \div 6) - (280 \div 7) = 50 - 40 = 10 10508 + 9402 + 7305 = 27215 38. 89 + 674 + 7086 + 12803 = 20752 38069 + 904 + 94 + 2605 = 41672 56 \div 8 \cdot (12 \div 12) - 92 \div 4 \cdot (3 \cdot 0) = 7 \cdot 1 - 23 \cdot 0 = 7 39. 810236 - (156039 + 84985) = 810236 - 241024 = 569212 72636 + (62030 - 44026) = 72636 + 18004 = 90640 19782 + (20707 - 10240) = 19782 + 10467 = 30249 All 39 lines solved. Final answers: see each line's computed value above.