23 out of 18 - (5 out of 18-7 out of 25) It's easy It's best not to share

23 out of 18 - (5 out of 18-7 out of 25) It's easy It's best not to share

23/18-(5/18-7/25)
=(23/18-5/18)+7/25
=1+7/25
=32/25

The first question: 18 / 23 divided by 8 / 5 plus 23 points 18 × 3 / 8

18 / 23 ／ 8 / 5 + 3 / 23 18 × 8 = 5 / 23 18 × 8 = 18 / 23 × (5 / 8 + 3 / 8) = 18 / 23 × 1 = 18 / 23. I'm very happy to answer for you. I wish you progress in your study! The 1900 team will answer for you. If you don't understand, please ask! If you agree with me

Observe the following group of numbers and add appropriate numbers in brackets according to the rule: 1 / 3 minus 15 / 2 minus 4 / 63 () ()

5 out of 99, 6 out of 143
The law is positive and negative;
The first numerator is 1, the second numerator is 2, the fifth numerator is 5, and the sixth numerator is 6;
The denominator is relatively difficult: 3 = 1x3, 15 = 3x5, 35 = 5x7, 63 = 7x9, the following should be 9x11 = 99, 11x13 = 143