Simple operation of 5 / 7-5 / 9 * 5 / 7

Simple operation of 5 / 7-5 / 9 * 5 / 7


5/7-5/9*5/7
=5/7*(1-5/9)
=5/7*4/9
=20/63



Simple calculation of 7.5 divided by 5.4 divided by 1.9 × 5.4


1.9×5.4÷5.4÷7.5



Is there a simple calculation for 8 out of 15 + 2 out of 3-3 out of 4? If there is a simple calculation, how can it be done? It needs a specific process,


This is not simple, the original formula is 8 / 15 + 10 / 15-3 / 4 = 18 / 15-3 / 4 = 6 / 5-3 / 4 = 24 / 20-15 / 20 = 9 / 20 & nbsp; (9 / 20)