\(1,=x\left(x-2\right)^2\\ 2,=5x\left(x-1\right)\left(x+1\right)\\ 3,=\left(x-2\right)\left(x+2\right)\\ 4,=x\left(x-2\right)\left(x^2+2x+4\right)\\ 5,=3\left(x-2\right)^2\\ 6,=7\left(x+1\right)^2\\ 7,=3x\left(x+1\right)\\ 8,=\left(x-1\right)\left(x+1\right)\left(x^2+1\right)\\ 9,=5y\left(y-x\right)\\ 10,=\left(x+4\right)\left(x^2-4x+16\right)\\ 11,=\left(x-1\right)^2\left(x+1\right)^2\\ 12,=\left(x+2\right)^3\\ 13,=\left(2x+1\right)^3\\ 14,sai.đề\\ 15,=\left(x+y\right)\left(x-1\right)\\ 16,=\left(x-y\right)\left(1-y\right)\\ 17,=\left(x-y-z\right)\left(x-y+z\right)\\ 18,=2x\left(a-1\right)-3y\left(1-a\right)=\left(2x+3y\right)\left(a-1\right)\\ 19,=\left(x-y\right)\left(x^2+xy+y^2\right)-xy\left(x-y\right)=\left(x-y\right)\left(x^2+y^2\right)\\ 20,=\left(x-y\right)^3-\left(x-y\right)=\left(x-y\right)\left(x^2-2xy+y^2-1\right)\)
\(21,=2x\left(2a+3\right)+3y\left(2a+3\right)=\left(2a+3\right)\left(2x+3y\right)\\ 22,=\left(x+y\right)\left(x^2-xy+y^2\right)+xy\left(x+y\right)=\left(x+y\right)\left(x^2+y^2\right)\\ 23,=\left(x-2\right)\left(x+2\right)\left(x+5\right)\\ 24,=\left(a-b\right)\left(a+b\right)+c\left(a-b\right)=\left(a+b+c\right)\left(a-b\right)\\ 25,=\left(b-c\right)\left(b+c\right)+a\left(b-c\right)=\left(a+b+c\right)\left(b-c\right)\\ 26,=\left(c-a\right)\left(c+a\right)+b\left(c-a\right)=\left(c-a\right)\left(a+b+c\right)\\ 27,=\left(x-1\right)\left(x+1\right)\left(x+2\right)\\ 28,=\left(x-2\right)\left(x+1\right)\left(x-1\right)\\ 29,=x^2\left(x-2y\right)-y^2\left(x-2y\right)=\left(x-y\right)\left(x+y\right)\left(x-2y\right)\\ 30,=\left(x-2\right)\left(x+5\right)\\ 31,=\left(x+2\right)\left(x+5\right)\\ 32,=\left(x+4\right)\left(x-1\right)\\ 33,=\left(x+1\right)\left(x+4\right)\\ 34,=\left(x-2\right)\left(2x+1\right)\)