1)
6 2/13 - ( х - 1 5/13)= 3 7/13
х- 1 5/13 = 6 2/13 - 3 7/13
х= 2 8/13 + 1 5/13
х= 4
проверим:
6 2/13 - ( 4 -1 5/13 ) = 3 7/13
6 2 /13 - 2 8/13 = 3 7/13
3 7/13 = 3 7/13
2) (у+2 4/11 ) - 4 7/11 = 1 6/11
у+ 2 4/11 = 1 6/11 + 4 7/11
у= 6 2/11 - 2 4/11
у= 3 9/11
проверим:
( 3 9/11 + 2 4/11) - 4 7/11 = 1 6/11
6 2 /11 - 4 7/11 = 1 6/11
1 6/11 = 1 6/11
4) 6 5/8 - ( 3 3 /8 +1 7/8 ) =
= 6 5/8 - 5 2/8 = 1 3/8
5) ( 8 - 4 3/11) + 2 8/11 =
= 1 8/11 +2 8 /11 =
=3 + 16/11 = 3 + 1 5/11=
= 4 5/ 11
6) 11 1/7 - ( 5 4/7 + 3 6/7 )=
=11 1/7 - 9 3/7 =
= 1 5/7