bài 1:
\(1.3x-3y=3\cdot\left(x-y\right)\)
\(2.10x+15y=5\cdot\left(2x+3y\right)\)
\(3.3x-12y=3\cdot\left(x-4y\right)\)
\(3.4x-20=4\cdot\left(x-5\right)\)
\(5.6x-2x^2=2x\cdot\left(3-x\right)\)
\(6.2x-4x^2=2x\cdot\left(1-2x\right)\)
\(7.3x^2-6x=3x\cdot\left(x-2\right)\)
\(8.3x^2+6x=3x\cdot\left(x+2\right)\)
\(9.3xy+6xz=3x\cdot\left(y+2z\right)\)
\(10.18x^2y-12x^3=6x^2\left(3y-2x\right)\)
\(11.8xy^2-2x^2y=2xy\left(4y-x\right)\)
\(12.3xy^2+6xyz=3xy\left(y+2z\right)\)
bài 2:
\(1.2x^3-12x^2+18x=2x\left(x^2-6x+9\right)=2x\cdot\left(x-3\right)^2\)
\(2.8x^2y-8xy+2x=2x\cdot\left(4xy-4y+1\right)\)
\(3.5x^2y-35xy+60y=5y\cdot\left(x^2-7x+12\right)=5y\left(x-3\right)\left(x-4\right)\)
\(4.2x^2+5x^3+x^2y=x^2\cdot\left(5x+y+2\right)\)
\(5.2x^3y-8x^2y+8xy=2xy\left(x^2-4x+4\right)=2xy\cdot\left(x-2\right)^2\)
\(6.4x^2y-8xy^2+18x^2y^2=2xy\left(2x-4y+9xy\right)\)
bài 3:
\(1.5\left(x-y\right)-y\left(x-y\right)=\left(x-y\right)\left(5-y\right)\)
\(2.x\left(y+1\right)+8\left(y+1\right)=\left(x+8\right)\left(y+1\right)\)
\(3.5\left(x-y\right)-x\left(x-y\right)=\left(5-x\right)\left(x-y\right)\)
\(4.z\left(x+y\right)-5\left(x+y\right)=\left(z-5\right)\left(x+y\right)\)
\(5.3x\left(x+5\right)-2\left(5+x\right)=\left(x+5\right)\left(3x-2\right)\)
\(6.x^2\left(x-1\right)+4\left(x-1\right)=\left(x-1\right)\left(x^2+4\right)\)
