How to add and subtract fractions
If it is the same denominator fraction addition and subtraction, the denominator remains unchanged, and the molecular phase addition and subtraction (7 / 5-14 / 5 = (7-14) / 5 = - 7 / 5)
If the denominator is not changed, the numerator will be added and subtracted; if it is a different denominator fraction, the different denominator fraction will be converted into the same denominator fraction, (1 / 2 + 1 / 3 = 3 / 6 + 2 / 6 = 5 / 6) and then the same denominator fraction will be added and subtracted. The final result will be reduced to the simplest fraction