Tolong bntu ya kkk kakk​

1) a. 2 3/4 + 1 1/4

= (2 +1) ( 3/4 + 1/4)

= (3) (4/4)

= (3) (1)

= 4

b) 31% + 0,30

=0,31 + 0,30

= 0,61

2) 3 2/5 – 1 2/3

=17/5 – 5/3

= 51/15 – 25/15

= 26/15

= 1 11/15

B) 54% – 0,57

= 0,54 – 0,57

= – 0, 03

3) a. 1 6/7 x 1 3/5

= 13/7 x 8/5

= 104/35

= 2 34/35

B) 0,4 x 0,3

= 4/10 x 3/10

= 12/100

= 0,12