1.3xy-5y²+y=y(3x-5y+1)2.-6m³n²-4m²n³+10m²n²=-2m²n²(3m+2n-5)3.4x³yz²-8x²yz⁴+12x⁴y²z³=4x²yz²(x-2z²+3x²yz)