VA ROG MULT AJUTATI MA! AM NEVOIE URGENTA!
Calculati, utilizand formulele de prescurtare:
a) (1+x)² + (2+x)² + (3+x)²
b) 2x+y)² + (2x+y)(2x-3y)
c) (2x+3y)² + 4x(3x-2) + (2x-1)²
d) 3a+2b)² + (2a+b)(2a-b) - (3a-b)²
a) 1+2x+x²+4+2x+x²+9+6x+x²=14+10x+3x² b) 4x²+4xy+y²+4x²-9y²=8x²+4xy-8y² c)4x²+12xy+9y²+12x-8x+4x²-4x+1=8x²+12xy+9y²+8x² d)9a²+12ab+4b²+4a²-b²-9a²+6ab-b²=4a²+18ab+2b²
