Question

a) -7/25 . 11/13 + -7/25 . 2/13 - 18/25

b) 5/7 . 1/3 - 5/7 . 1/4 - 5/7 . 1/12

c) 5 + 2/5 . 4+ 2/7 + 5 + 5/7 . 5+ 2/5

d) 75% - 3/2 + 0,5 - [ -1/2]^2

Answer 1

a) -7/25 . 11/13 + -7/25 . 2/13 - 18/25=-1

b) 5/7 . 1/3 - 5/7 . 1/4 - 5/7 . 1/12=0

c) 5 + 2/5 . 4+ 2/7 + 5 + 5/7 . 5+ 2/5=18

d) 75% - 3/2 + 0,5 - [ -1/2]^2=-1/2

Answer 2

a) -7/25 x 11/13 + -7/25 x 2/13 - 18/25 = -1

b) 5/7 x 1/3 - 5/7 x 1/4 - 5/7 x 1/12=0

c) 5 + 2/5 x 4+ 2/7 + 5 + 5/7 x 5+ 2/5=15.85714285

 

Answer 3

d) 75% - 3/2 + 0,5 - [ -1/2]^2=1/2

Answer 4

a)= -7/25 . (11/13 + 2/13) - 18/25

= -7/25 . 1 - 18/25

=  -7/25 - 18/25= -1

b)

= 5/7 . (1/3 - 1/4 - 1/12)

= 5/7 . (4/12 - 3/12 - 1/12)

= 5/7 . 0 = 5/7

c)

= 5 + 5 + (2/5 x 4) + (5/7 x 5) +( 2/7+2/5)

=10 + 8/5 + 25/7 +24/35

=10+ (8/5 + 25/7 + 24/35)

=10 + 41/7=111/7

d)

= 75/100 - 3/2 + 5/10 + (1/2)²

= 3/4 - 3/2 + 1/2 + 1/4

= 3/4 - 6/4 + 2/4 +1/4= 0