Kết quả tìm kiếm

2x^2-5x-7 =2x^2+2x-7x-7 =2x(x+1)-7(x+1) =(x+1)(2x-7) 3x^3-7x-10 =3x^3-6x^2+6x^2-12x+5x-10 =3x^2(x-2)+6x(x-2)+5(x-2) =(x-2)(3x^2+6x+5)

3x(x-50)-x+50=0 =>3x^2-150x-x+50=0 =>3x(x-50)-(x-50) =>(x-50)(3x-1)=0 <=>TH1 x=50 TH2 x=1/3 x(x+1)(x+2)=0 <=>x=0 <=>x+1=0<=>x=-1 <=>x+2=0<=>x=-2 5x^2-4(x^2-2x+1)-5=0 <=>5x^2-5-4(x-1)^2=0 <=>5(x^2-1)-4(x-1)^2=0 <=>5(x-1)(x+1)-4(x-1)^2=0 <=>(x-1)(5x+5-4x+4)=0( Chỗ này làm tắt )...