Question

Ayúdenme es urgente es de fracciones

2/3 - 3/4 + 5/6

7/10 - 5/6 + 1/5

7/9 + 5/6 + 2/3

13/16 + 11/24 - 7/12

con operaciones porfa

Answer 1

Usa la cara feliz, ejemplo:
2  _  3
3      4
primero multiplicas en cruz 2por4 y 3por3 (eso va arriba) luego multiplicas los denominadores 3por4, queda asi:
2por4-3por3/3por4=8-9/12=-1/12

Answer 2

2/3-3/4+5/6
= 4*2-3*3/12 + 5/6
=8-9/12 + 5/6
= -1/12 + 5/6
= 1*1+2*5/12
=-1+2*5/12
=-1+10/12
=9/12
=3/4

7/10-5/6+1/5
=3*7-5*5/30+1/5
=21-25/30+1/5
= -4/30+ 1/5
= -2/15+1/5
= 1*2+3*1/15
=-2+3 / 1
= 1/5




7/9+5/6+2/3
=2*7+3*5 /18 + 2/3
=14+15 /18 +2/3
=29/18+2/3
=1*29+6*2 /18
=29+12 /18
=41/18




13/16+11/24-7/12
=3*13+2*11/48 -7/12
=39+22/48 -7/12
=61/48-7/12
=1*61-4*7 /48
= 61-28/48
=33/48
=11/16