`63.(63-3)+3.(63-3)=63.60+3.60=60.66=3960`

she/her

It is he who does that.

`1. A`

`2. B`

`3. B`

`4. B`

`5. A`

`a) `2Na +2(H_2)0 -> 2NaOH + H_2`

`2Al+2NaOH+2(H_2)0 -> 2NaAl0_2 + 3H_2`

`b) Ca+2(H_2)0 -> Ca(OH)_2 + H_2`

`Al+Ca(OH)_2+(H_2)0 -> Ca(AlO_2)_2 +H_2`

`3m^2 20cm^2=30020cm^2`

`5`. The

`6`. The

`7.` the

`8`. the

`9`. the

`C.` mine, my

`a) 101+100+99+98+...+2+1=(101+1).101/2=5151`

`101-100+99-98+...+3-2+1= (101-100)+(99-98)+...+(3-2)+1`

Số số cặp: `(101-3):2+1=50`

`A=5151/(1.50)=5151/50`

`b) 3737.43-4343.37=3737.43-43.101.37=3737.(43-43)=3737.0=0`

`=> B=0/(2+4+6+...+100)=0`

ok