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2. = 2Q/4 = 1/2 Q
3. = 3k+8k/12 = 11/12 k
4. = 5b+4a/ab
5. = 2 (a-1) + a + 3 /8
= 2a - 2 + a +3 / 8
= 3a + 1 / 8
6. = 3 (b+3) - 2 (b-1) / 12
= 3b + 9 - 2b+ 2 /12
= b+11/12
7. = × + 1 + 2 (×-2) /6×
= × + 1 + 2× - 4 /6×
= 3× - 3 / 6×
= 3 (× - 1) / 6×
= × - 1 / 2×
8. = 3×y - y (×+3) / y^2
= 3×y - y× + 3y / y^2
= 2xy + 3y / y^2
= y (2x + 3) / y^2
= 2x+3 / y