Question

va rog din suflet ajutati-ma la ex 3 si 4 va multumesc

Answer 1

5/12 + 5/24 = 10/24 +5/24 = 15/24 = 5/8
26/21 + 13/14 = (2*26)/42 + (3*13)/42 = 52/42+39/42 = 91/42= 13/6
4/15 +3/20 = (4*4)/60 + (3*3)/60 = 16/60+9/60 = 25/60 = 5/12
5/24+1/12+3/8 = 5/24+2/24+9/24=16/24 = 2/3
7/30-3/20=14/60-9/60=5/60=1/12
8/15-9/20=(8*4)/60-(9*3)/60=32/60-27/60=5/60=1/12
8/21-4/35=(8*5)/105-(4*3)/105= 40/105-12/105=28/105=4/15
7/6-3/4-1/12=(7*2)/12-(3*3)/12-1/12=14/12-9/12-1/12=4/12=1/3

2 si 1/7 + 3 si 3/7 = 14/7 + 1/7 + 21/7 + 3/7 = 39/7 = (35+4)/7 = 35/7 + 4/7 = 5 si 4/7
1 si 2/5 + 3 si 1/10 = 5/5+2/5+30/10+1/10 = 7/5+31/10 = 14/10+31/10 = 45/10 = 9/2 = (8+1)/2 = 8/2+1/2 = 4 si 1/2
3 si 1/3 + 2 si 2/5 = 9/3+1/3+10/5+2/5 = 10/3+12/5 = (10*5)/15+(12*3)/15= 50/15+36/15 = 86/15 = (75+11)/15 = 75/15+11/15 = 5 si 11/15
3 si 5/21+1 si 7/12 = 63/21+5/21+12/12+7/12 = 68/21 + 19/12 = (68*4)/84 + (19*7)/84 = 272/84+133/84=405/84 = 135/28 = (112+23)/28 = 112/28+23/28 = 4+23/28 = 4 si 23/28
Imi pare rau, nu mai am timp pentru celelalte