Aidez moi s'il vous plait :(​

A=5/8+1/6
=15/24+4/24
=19/24
B=7/15-3/10
=14/30-9/30
=5/30
=1/6
C=9-2x(-5):18:(-6)
=9+10×1/18×1/-6
=9+5/9×1/-6
=486/54-5/54
=481/54

D=12-3(-10×1/8×1/-4)
=12-3(5/4×1/4)
=12-3×5/16
=12-15/16
=192/16-15/16
=177/16