math questions F2 today

1) 7a b
----- x -------
2
5b a



2) 2b 1
------- ÷ ----
2
a 2a

( )
3) b 6a b×6 ×a
----- x ----- = --------------------
( )
4 ab 4 ×a×b


4) 2x 10
------- + ----- =
x+5 x+5


5) 5 2
-------- + ------=
a-1 a-1



6) 4 2
------ - -----=
x-3 3-x

7) a 4
------- - ------ =
a+2 a+2

8) 3x 1
------ + ----- =
3x-1 1-3x