tolong jawab ya terima kasih!!!

a). 2/15 - ½ +3/10
=4/30 - 15/30 + 9/30
= -2/30
= - 1/15
b).3/7 + 4/21 -13/14
=9/21 + 4/21 - 13/14
=13/21 - 13/14
=26/42 - 39/42
=13/42
c).4 2/5- 1⅓ + 2¾
=22/5 - 4/3 + 11/4
=66/15 - 20/15 + 11/4
=46/15 - 11/4
=184/60 - 165/60
=19/60
d). 10¼ - 1⅔ + 20⅞
=41/4 - 5/3 + 167/8
=246/24 - 40/24 + 501/24
=206/24 + 501/34
=707/24