Question

ex.3 va roggg si dau 54 de puncte

Answer 1

a) (2 + 37/12) : 5/2 = 24 + 37 * 2  = 61  * 2  = 61      = 61/30 = 2 si 1/30
                                   12       5     12    5     6 * 5
b) 1/4 * (2 + 3 * 2) = 1/4 * 8 = 2
c) (6/12 + 8/12 - 3/12) : 11/120 = 11/12 * 120/11 = 10
d) (6/12 + 10/12 - 9/12) : 7/300 = 7/12 * 300/7 = 25
e) (28/70 + 10/70 - 5/70) * 91/3 = 33/70 * 91/3 = 11/70 * 91 = 1001/70 = 14 si  21/70
f) 24 * (12/24 + 4/24 + 3/24) = 24 * 19/24 = 19
g) 3 - 3 : (12/4 + 3/4) = 3 - 3 * 4/15 = 3 - 4/5 = 15/5 - 4/5 = 11/5 = 2 si 1/5
h) 3/2 - 1/3 : (5/15 + 3/15) = 3/2 - 1/3 * 15/8 = 3/2 - 5/8 = 12/8 - 5/8 = 7/8
j) 1/2 - 1/2 : ( 6/6 + 3/6 - 2/6) = 1/2 - 1/2 * 6/7 = 1/2 - 3/7 = 7/14 - 6/14 = 1/14

Answer 2

a) (2 + 37/12) : 5/2 = (24/12 + 37/12) * 2/5 = 61/12  * 2/5  = 61/30
                                
b) 1/4 * (2 + 3 * 2) = 1/4 * 8 = 2

c) (6/12 + 8/12 - 3/12) : 11/120 = 11/12 * 120/11 = 10

d) (6/12 + 10/12 - 9/12) : 7/300 = 7/12 * 300/7 = 25

e) (28/70 + 10/70 - 5/70) * 91/3 = 33/70 * 91/3 = 11/70 * 91 = 1001/70

f) 24 * (12/24 + 4/24 + 3/24) = 24 * 19/24 = 19

g) 3 - 3 : (12/4 + 3/4) = 3 - 3 * 4/15 = 3 - 4/5 = 15/5 - 4/5 = 11/5

h) 3/2 - 1/3 : (5/15 + 3/15) = 3/2 - 1/3 * 15/8 = 3/2 - 5/8 = 12/8 - 5/8 = 7/8
j) 1/2 - 1/2 : ( 6/6 + 3/6 - 2/6) = 1/2 - 1/2 * 6/7 = 1/2 - 3/7 = 7/14 - 6/14 = 1/14