Question

Va rog frumos Ajutațima dau coroana !!
Utilizând formulele de calcul prescurtat efectuați ..
(x+2y)²
(Y+3)²
(X-2)²
(3-b)²
(a-1)²
(2a-b)²
(x+1)(x-1)
(2x-1)(2x+1)
(2x-1)(2x+1)
(2x-3)²
(11x+3)²
(a-3)(a+3)
(2y-3x)(2y+3x)
(3x+5y)²
(3x+4y)(3x-4y)

Answer 1

1) (x+2y)²=x²+4xy+4y²
2) (y+3)²=y²+6y+9
3) (x-2)²=x²-4x+4
4) (3-b)²=9-6b+b²
5) (a-1)²= a²-2a+1â
6) (2a-b)²= 4a²-4ab+b²
7) (x+1)(x-1)=x²-1
8)(2x-1)(2x+1)=4x²-1
9) (2x-3)²=4x²-12x+9
10) (11x+3)²=121x²+66x+9
11) (a-3)(a+3)=a²-9
12) (2y-3x)(2y+3x)=4y²-9x²
13) (3x+5y)²=9x²+30xy+25y²
14) (3x+4y)(3x-4y)=9x²-16y²

Sper că te-am ajutat!