Найдите разность (263-265): 1) 1/3- 1/5; 2) 4/7-3/10; 3) 8/15-1/2; 4) 3/5-1/7.

263-265= -2

1/3-1/5=5/15-3/15=2/15

4/7-3/10=40/70-21/70=19/70

8/15-1/2=16/30-15/30=1/30

3/5-1/7=21/35-5/35=16/35

1) 1/3 - 1/5 = 5/15 - 3/15 = 2/15

2)4/7 - 3/10 = 40/70 - 21/70 = 19/70

3)8/15 - 1/2 = 16/30 - 15/30 = 1/30

4)3/5 - 1/7 = 21/35 - 5/35 = 16/35