1)
a) \(15y+12x=3\left(5y+4x\right)\)
b) \(x^2-6x+9=\left(x-3\right)^2\)
c) \(y^3+2y^2+3y=y\left(y^2+2y+3\right)\)
d) \(x^2+xy+6x+6y=x\left(x+y\right)+6\left(x+y\right)\)
Bài 2:
a) \(93^2-7^2=\left(93-7\right)\left(93+7\right)=86.100=8600\)
b) \(=\left(45+55\right)^2=100^2=10000\)


