0-9 number plus number equals one digit number minus number equals one digit number and the remaining number equals two digits. It cannot be repeated
3 + 6 = 9,8-7 = 1,4 × 5 = 20, all numbers are only used once
3 + 6 = 9,8-7 = 1,4 × 5 = 20, all numbers are only used once