1) 3 1/2+1 5/6; 2) 4 2/5+9 3/7; 3) 8 3/4+2 7/8; - вопрос №824716013121562425937383427842381565615123 от Эзоз 31.01.2020 11:12

Question

Математика: 1) 3 1/2+1 5/6; 2) 4 2/5+9 3/7; 3) 8 3/4+2 7/8; 4) 2 3/8+1 5/6; 5) 6 1/5+1 2/3; 6) 4 3/8+8 1/2. 15

Эзоз · Answer

1)3 1/2 + 1 5/6 = 7/2 + 11/6 = (7 × 3 + 11 × 1)/6 = 21/6 + 11/6 = 32/6 = 16/3 = 5 1/3
2)4 2/5 + 9 3/7 = 22/5 + 66/7 =(22 × 7 + 66 × 5)/35 = 154/35 + 330/35 = 484/35 = 13 29/35
3)8 3/4 + 2 7/8 = 35/4 + 23/8 = (35 × 2 + 23 × 1)/8 = 70/8 + 23/8 = 93/8 = 11 5/8
4)2 3/8 + 1 5/6 = 19/8 + 11/6 = (19 × 3 + 11 × 4)/24 = 57/24 + 44/24 = 101/24 = 4 5/24
5)6 1/5 + 1 2/3 = 31/5 + 5/3 =(31 × 3 + 5 × 5)/15 = 93/15 + 25/15 = 118/15 = 7 13/15
6)4 3/8 + 8 1/2 = 35/8 + 17/2 = (35 × 1 + 17 × 4)/8 = 35/8 + 68/8 = 103/8 = 12 7/8