If a times 4 / 15 = B divided by 4 / 15 = C, ABC is greater than 0, then (?) is less than (?) is less than (?)

If a times 4 / 15 = B divided by 4 / 15 = C, ABC is greater than 0, then (?) is less than (?) is less than (?)

a×4/15=b×15/4=c×1
4/15

It is known that a belongs to the real number r. try to compare the size of 1 / 1-A and 1 + a

6.2 how to compare the size of two real numbers

Comparing the size of two real numbers is the same as comparing the size of two rational numbers. There are many methods. For real numbers expressed in different forms, we should flexibly choose the method of comparing the size;,
And because
According to the two negative numbers, the greater the absolute value is, the smaller it is