A=5/3-4/15
=25-4/15
=21/15
=21÷3/15÷3
=7/5
B=8/7-6/7×5/3
=8/7-30/21
=8/7 -(30÷3/21÷3)
=8/7-10/7
=-2/7
C=3-(4/5-2/3)
=3-(12-10/15)
=3-(2/15)
=3-2/15
=45-2/15
=43/15
J'espère avoir bien compris la question, mais si non, tu peux toujours me le dire
