Ответ:889989 + 1 = 889990.55283 − 50000 = 5283.27836 + 2000 = 29836.1000 − 1 = 999.11100 : 100 = 111.740 − (570 + 70) = 740 − 640 = 100.(456 − 7 * 8) : 10 = (456 − 56) : 10 = 400 : 10 = 40.4912 * 100 = 491200.