Question

Va rog urgent dau corona sa fie bine si corect​

Answer 1

Răspuns:

Formulele de calcul prescurtat:

(a+b)^2=a^2+2ab+b^2

(a-b)^2=a^2-2ab+b^2

(a+b)(a-b)=a^2-b^2

1. a)(x+3y)^2=x^2+6xy+9y^2

(2x+7)^2=4x^2+28x+49

(x-6y)^2=x^2-12xy+y^2

9x^2-30x+25

x^2-49y^2

25x-1

2.

(x+y)^2

(3x+4)^2

(x-2y)^2

(4x-5)^2

(x+11)(x-11)

(4x+6y)(4x-6y)