Question

Va rog ajutatima dau coroana !!!
(X+y+z)²
(2x+3y+z)²
(a+b+1)²
(x-y+3)²
(a-4b-3c)²
(2x-2y-1)²
(2x-2y-1)²
(x+2)³
(X-1)³
(2x-y)³

Answer 1

1) (x+y+z)²=x²+y²+z²+2xy+2yz+2xz

2) (2x+3y+z)²=4x²+9y²+z²+2×2x×3y+2×3y×z+2×2x×z=4x²+9y²+z²+12xy+6yz+4xz

3) (a+b+1)²=a²+b²+1+2ab+2b+2a

4) (x-y+3)²=x²+y²+9-2xy-6y+6x

5) (a-4b-3c)²=a²+16b²+9c²+8ab+12bc-6ac

6) (2x-2y-1)²=4x²+4y²+1+8xy+4y+4x

7) (x+2)³=x³+3×x²×2+3×x+4+8=x³+6x²+12x+8

8) (x-1)³=x³-3×x²×1+3×x×1-1=x³-3x²+3x-1

9) (2x-y)³=8x³-3×8x³×y+3×2x×y²-y³=8x³-24x³y+6y²-y³

Sper că te-am ajutat!