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Bài 2.
a) \(6x^2+12xy=6x\left(x+2y\right)\)
b) \(3x+12-\left(x^2+4x\right)\)
\(=3x-x^2+12-4x\)
\(=x\left(3-x\right)+4\left(3-x\right)\)
\(=\left(3-x\right)\left(x+4\right)\)
c) \(x^2+2xy+y^2=\left(x+y\right)^2\)

with

With

with
cố gắng vượt qua cái trò chơi này nha:))))

such

like(chắc vậy)

short

short

short

would

Would 

would

During

during

During the breaktime, we usually play in the schoolyard

Đáp án: During

\(4P+5O_2->2P_2O_5\)

\(Zn+2HCl->ZnCl_2+H_2\)

\(2Ca+O_2->2CaO\)

\(FeCl_3+3NaOH->Fe\left(OH\right)_3+3NaCl\)