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А) 743а - (15960040 + 7899) = 743а - 3990 - 7899 = 743а - 11889;
743а - 11889 = 743 800 - 11889 = 594400 - 11889 = 582511
743а - 11889 = 743 630 - 11889 = 468090 - 11889 = 456201

) 8900 60 - b 80 = 534000 - b 80
534000 - b 80 = 534000 - 195760 80 = 534000 - 2447 = 531553
534000 - b 80 = 534000 - 655440 80 = 534000 - 8193 = 525807

б) x - 670 94 + 75880 7 = x - 62980 + 10840 = x - 52140
x - 52140 = 129689 - 52140 = 77549
x - 52140 = 83000 - 52140 = 30860

в) (600000 - 986750 50) у = (600000 - 19735) у = 580265у
580265у = 580265 47 = 27272455
580265у = 580265 600 = 348159000

г) х - 23986 + 648 4300 = х - 23986 + 2786400 = х + 2762414
х + 2762414 = 800000 + 2762414 = 3562414
х + 2762414 = 93000 + 2762414 = 2855414

г) (2032456 - 1456987) а - 2369265 = 575469а - 2369265
575469а - 2369265 = 575469 69 - 2369265 = 39707361 - 2369265 = 37338096

д) (77838 + 3702) (280с - 224214) 30 = 81540 (8400с - 6726420) = 81540 (8400 804 - 6726420) = 81540 (6753600 - 6726420) = 81540 27180 = 3

е) 5207 96 + 4571040 b - (900 4000 - 3093518) = 499872 + 4571040 b - (3600000 - 3093518) = 499872 + 4571040 534 - 506482 = -6610 + 8560 = 8560 - 6610 = 1950

ж) (325х - 91 250) 56938 = (325 70 - 22750) 56938 = (22750 - 22750) 56938 = 0 56938 = 0

з) 873200 8732 (1922800 с) = 100 (1922800 с) = 100 50600 = 5060000.