分解因式:=_____________________________.
多项式x2y+2xy2除以整式A,得x+2y,则整式A=_________________;
方程(x-4)(x+3)=0的解是__________________;
方程-2x(x+3)=0的解是_______________;
计算:(x2+2x+1)÷(x+1)=______________.
计算:5752×12-4252×12=_________.