+,•,-,или:. (50 5) 9=5,70+28 7=74, 56 8•7=49, 8 6+52=100, 63 (13-6)=9, 84 14=98, 90 10=9

спасибо

(50 - 5) : 9 = 570 + 28 : 7 = 7456 : 8 * 7 = 498 * 6 + 52 = 10063 : (13 - 6) = 984 + 14 = 9890 : 10 = 9