Question

Вычислите ! 1)8/9 +4/15; 2)7/16 - 5/24; 3)9/26 - 3/13; 4)4 5/8 - 2 1/12; 5) 6 6/11 + 3 5/6; 6)5 3/14 - 3 8/21

Answer 1

1) 8/9 +4/15 = 52/45
2) 7/16 - 5/24 = 11/48
3) 9/26 - 3/13 = 3/26
4) 4 5/8 - 2 1/12 = 37/8 - 25/12 = 61/24
5) 6 6/11 + 3 5/6 = 72/11 + 23/6 = 685/66
6) 5 3/14 - 3 8/21 = 73/14 - 71/21 = 11/6

Answer 2

8/9+4/15=(8*5+4*3)/45=(40+12)/45=52/45
7/16-5/24=(7*3-5*2)/48=(21-10)/48=11/48
9/26-3/13=(9-3*2)/26=(9-6)/26=3/26
4 5/8 - 2 1/12=37/8-25/12=(37*3-25*2)/24=(111-50)/24=61/24=2 13/24
6 6/11 + 3 5/6=72/11+23/6=(72*6+23*11)/66=(432+253)/66=685/66= 10 25/66
5 3/14 - 3 8/21=73/14-71/21=(73*3-71*2)/42=(219-142)/42=77/42=1 5/6