Phan tích da thức thanh nhan tu x*x-21*x+10 06/07/2021 Bởi Melody Phan tích da thức thanh nhan tu x*x-21*x+10
x.x-21x+10 =x²-21x+10 =(x²-2.x.21/2+441/4)-401/4 =(x-21/2)²-401/4 =(x-21/2 -√401/2)(x-21/2 +√401/2) =(x+(-21+√401)/2)(x+(-21+√401)/2)) Bình luận
x.x-21x+10
=x²-21x+10
=(x²-2.x.21/2+441/4)-401/4
=(x-21/2)²-401/4
=(x-21/2 -√401/2)(x-21/2 +√401/2)
=(x+(-21+√401)/2)(x+(-21+√401)/2))