Bài 1:
\(a,=7xy\left(2x-3y+4xy\right)\\ b,=\left(x+y\right)\left(x-5\right)\\ c,=2\left(5x+4\right)\left(x-y\right)\\ d,=\left(3x+1-x-1\right)\left(3x+1+x+1\right)=2x\left(4x+2\right)=4x\left(2x+1\right)\)
Bài 2:
\(a,=5xy\left(3x+4y-5\right)\\ b,=\left(x+y-5\right)\left(x+y+5\right)\\ c,=\left(y-1\right)^2\\ d,=4x\left(x+2y\right)-3\left(x+2y\right)=\left(4x-3\right)\left(x+2y\right)\\ e,=\left(x+3\right)^3\\ f,=x^2\left(2-z\right)+y^2\left(2-z\right)-\left(2-z\right)=\left(x^2+y^2-1\right)\left(2-z\right)\\ g,=\left(2-3x\right)\left(4+6x+9x^2\right)\\ h,=3\left(x-y\right)^2\\ i,=\left(1-2x\right)\left(1+2x\right)\\ k,=2\left(8x^3+27y^3\right)=2\left(2x+3y\right)\left(4x^2+6xy+9y^2\right)\\ l,=\left(x-y\right)^2-16=\left(x-y-4\right)\left(x-y+4\right)\\ m,=x\left(x^5-x^3+2x+2\right)\\ =x\left(x^5+x^4-x^4-x^3+2x+2\right)\\ =x\left(x+1\right)\left(x^4-x^3+2\right)\)
