33. OUr homework has just been done.

34. If I had a map, I could find the way to your house.

35. Julia is more intelligent than Mary.

36. Tim asked his girlfriend what movie they were going to see the next day.

ĐK: `a \ne 1 ; a>=0` 

`C=(\sqrta/(\sqrta-1)-\sqrta/(a-1)) : (\sqrta+1)/(a-1)`

`=(\sqrta/(\sqrta-1) - \sqrta/((\sqrta-1)(\sqrta+1))) . (a-1)/(\sqrta+1)`

`= (\sqrta(\sqrta+1)-\sqrta)/((\sqrta-1)(\sqrta+1)) . ((\sqrta-1)(\sqrta+1))/(\sqrta+1)`

`= a/(\sqrta+1)`

`B=(x/2+y)^3-6(x/2+y)^2z + 6(x+2y)z^2-8z^3`

`=(x/2+y)^3 - 3. (x/2+y)^2 . 2z + 3. (x/2+y) . (2z)^2 - (2z)^3`

`=(x/2+y-2z)^3`

`2sin^2x+\sqrt3sin2x=3`

`<=>2. (1-cos2x)/2 + \sqrt3sin2x=3`

`<=>\sqrt3sin2x-cos2x=2`

`<=> \sqrt3/2 sin2x-1/2 cos2x=1`

`<=>sin (2x-π/6) = 1`

`<=> 2x-π/6=π/2+k2π`

`<=> x=π/3+kπ (k \in ZZ)`.

- Kinh nghiệm tình trường đầy mình có khác, tại hạ bái phục. :D

`MO + 2HCl -> MCl_2 + H_2O`

Theo PT: `n_(MO) = (n_(HCl))/2`

`<=> 8/(M_M +16) = (0,4)/2`

`<=> M_M = 24`

`=>M` là `Mg`.

- Đọc nó không thuận mồm. :v