1) 1/2 + 2/5 =
2)3/4 + 1/7 =
3)3/8 + 2/3
4)1/5 + 2/3 =
5)11/12 + 3/4 =


Приведите к знаменателю 5/17 2/3 4/9



ПОЖАЛУЙСТА ПОМОГИТЕЕ!!!!!!!!!!!!!!

1) 1/2 + 2/5 = 5/10 + 4/10 = 9/102) 3/4 + 1/7 = 21/28 + 4/28 = 25/283) 3/8 + 2/3 = 9/24 + 16/24 = 25/24 = 1 1/244) 1/5 + 2/3 = 3/15 + 10/15 = 13/155) 11/12 + 3/4 = 11/12 + 9/12 = 20/12 = 1 8/12 = 1 2/35/17 2/3 4/9 = 45/153  102/153  68/153