Big poin tolong jawab dong???????!!!!! satu sampai lima dijawab pake cara

1)
2/7=0,285
5/11=0,454
4/15=0,266
3/8=0,375
Jawabannya C
2)
=7 3/4 + 1/6 - (-2 1/3)
=31/4 +1/6 + 7/3
=93/12 + 2/12 + 28/12
=123/12 = 41/4 = 10 1/4
Jawabannya D
3)
=2 1/4 x 2/5 : 1 5/7
= 9/4 x 2/5 : 12/7
=9/4 x 2/5 x 7/12
=21/40
Jawabannya D
4) Maaf
5)
=4 2/3 : 1 1/6 - 2 1/3
=14/3 : 7/6 - 7/3
=14/3 x 6/7 - 7/3
=4/1 - 7/3
=12/3 - 7/3
=5/3