Question

Calcule as frações e se possível simplifique:

A) 4/9 + 1/2 =

16/18 ( )

17/18 ( )

18/17 ( )

20/15 ( )

6/18 ( )


B) 6/7 - 2/7 =

1/7 ( )

2/7 ( )

3/7 ( )

4/7 ( )

5/7 ( )


C) 21/16 + 5/16

10/8 ( )

11/8 ( )

12/8 ( )

13/8 ( )

14/8 ( )


D) 7/5 - 3/4

9/20 ( )

10/20 ( )

11/20 ( )

12/20 ( )

13/20 ( )


E) 6/4 + 5/3 =

17/6 ( )

18/6 ( )

19/6 ( )

20/6 ( )

21/6 ( )

Answer 1

a)4/9+1/2=

4•2/9•2=

4•2/9•2+1•9/2•9=

8/18+9/18=

8+9/18=

17/18

b)6/7-2/7=

6-2/7=

4/7

c)21/16+5/16=

21+5/16=

26/16=

13/8

d)7/5-3/4=

7•4/5•4-3•5/4•5=

28/20-15/20=

28-15/20=

13/20

e)6/4+5/3=

3/2+5/3=

3•3/2•3+5•2/3•2=

9/6+10/6=

9+10/6=

19/6

Espero ter ajudado!