\(1,=\left(3x-5\right)\left(x-y\right)\\ 2,=\left(x+2\right)^2-y^2=\left(x-y+2\right)\left(x+y+2\right)\\ 3,=3\left[\left(x+y\right)^2-z^2\right]=3\left(x+y-z\right)\left(x+y+z\right)\\ 4,=\left(x-y\right)^2-\left(z-t\right)^2=\left(x-y-z+t\right)\left(x-y+z-t\right)\\ 5,=\left(x-5\right)\left(y+2\right)\\ 6,=2x\left(y+1\right)+z\left(y+1\right)=\left(2x+z\right)\left(y+1\right)\\ 7,=5x\left(x+y\right)^2\\ 8,=\left(x-y\right)^2-4=\left(x-y-2\right)\left(x-y+2\right)\\ 9,=2xy\left(x^2-y^2-2y-1\right)=2xy\left[x^2-\left(y+1\right)^2\right]\\ =2xy\left(x-y-1\right)\left(x+y+1\right)\\ 10,=\left(x+1\right)^2-y^2=\left(x-y+1\right)\left(x+y+1\right)\)
