Question

1) 3/7a + 2/5 = 1
2)3 1/3 : k = 1 1/3 : 2
3)y : 1 1/2 =2 1/3 * 1/3

Answer 1

1 ) 3/7а +2/5=1
3/7а=1-2/5
3/7а=3/5
а=3/5:3/7
а=1 2/5=1.4
Ответ:а=1.4
2) 3 1/3:к=11/3:2
к=1 9/11
3)у:11/2=2 1/3*1/3
у= 7/18