3<x≤7 ∩ 5≤x≤9
---o*-->x **>x
3 7 5 9
x∈(3; 7] ∩ x∈[5; 9]
o***>x
3 5 7 9
(3; 7] ∩ [5; 9] = [5; 7]
3<x≤7 U 5≤x≤9
---o*-->x **>x
3 7 5 9
x∈(3; 7] ∪ x∈[5; 9]
o***>x
3 5 7 9
(3; 7] ∪ [5; 9] = (3; 9]
3<x≤7 ∩ 5≤x≤9
---o*-->x **>x
3 7 5 9
x∈(3; 7] ∩ x∈[5; 9]
o***>x
3 5 7 9
(3; 7] ∩ [5; 9] = [5; 7]
3<x≤7 U 5≤x≤9
---o*-->x **>x
3 7 5 9
x∈(3; 7] ∪ x∈[5; 9]
o***>x
3 5 7 9
(3; 7] ∪ [5; 9] = (3; 9]
2)5ц1/8-3ц3/8=2+1-3/8=2+-2/8=2*8/8-2/8=16-2/8=14/8=7/4=1ц3/4
3)7ц1/2-1ц3/4=6+1*2/2*2-3/4=6+2/4-3/4=6+(-1/4)-1/4=24-1/4=23/4=5ц3/4