Question

khai triển các hằng đẳng thức:

1) (3x + 1)² - (x - 2)²

2) (y - 3)² - ( y - 1)²

Answer 1

Câu 1:

(3x+1)²_(x-2)²

=[(3x)²+2×3x×1+1³]-[x²+2×x×2+2²]

=(9x²+6x+1)-(x²+4x+4)

=9x²+6x+11-x²-4x-4

Answer 2

Câu 2 :

(y-3)²-(y-1)²

=(y²-2×y×3+3²)-(y²+2×y×1+1)

= y²-6y+99-y²-2y-1

Answer 3

1.(3x+1)^2-(x-2)^2

=(3x+1+x-2)(3x+1-x+2)

=(4x-1)(2x+3)=8x^2+12x-2x-3

=8x^2+10x-3y

2.(y-3)^2-(y-1)^2

=(y-3+y-1)(y-3-y+1)

=(2x-4)(-2)

=-4x+8

Answer 4

Nếu sai thì bạn bỏ qua cho mk nhé

Mk đg vội😂😂😂😂

Answer 5

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