Question

c si d va rog dau coroana

Answer 1

C)

(-5/21 + 9/14) : 2.3/7 (-3/8+1/12): 1.7/8
17/42 : 2.3/7 (-3/8 +1/12) : 1. 7/8
17/42 : 17/7( - 3/8 + 1/12) : 1.7/8
17/42 : 17/7 - 7/24 : 1.7/8
17/42 : 17/7 - 7/24 : 15/8
17/42 x 7/17 - 7/24x 8/15
1/42 x 7 - 7/24 x 8/15
1/6 - 7/24 x 8/15
1/6 - 7/3 x 1/15
1/6-7/45= 1/90

D)

((-10/9) : (35/27) + (4/21) : (-2/3) : (-3/14)
(-10/9 : 35/27 + (-4/27) : (-2/3)) : 3/14
(-10/9 x 27/35 + 4/21 x 3/2) : 3/14
(-10/9 x 27/35 + 4/21 x 3/2) x 14/3
(-10 x 3/35 + 4/21 x 3/2) x 14/3
(-2 x 3/7 + 4/21 x 3/2) x 14/3
(-2 x 3/7 +2/21 x 3) x 14/3
(-2 x 3/7 + 2/7) x 14/3
(-6/7 +2/7) x 14/3
-4/7 x 14/3=-3/8