Раскройте скобки: 1. (a+x)^{2}. 2. (y-2)^{2}. 3. (2a+1)^{2}. 4. (3c-2)^{2}. 5. (7-a)^{2} 6. (x^{2}+1)^{2} 7. (a^{2}+3x)^{2} 8. (c^{2}+d^{2})^{2} 9. (a^{3}+3b)^{2},

(a+x)^{2} = a^{2} + 2ax + x^{2}.

(y-2)^{2} = y^{2} - 4y + 4.

(2a+1)^{2} = 4a^{2} + 4a + 1.

(3c-2)^{2} = 9c^{2} - 12c + 4.

(7-a)^{2} = 49 - 14a + a^{2}.

(x^{2}+1)^{2} = x^{4} + 2x^{2} + 1.

(a^{2}+3x)^{2} = a^{4} + 6a^{2}x + 9x^{2}.

(c^{2}+d^{2})^{2} = c^{4} + 2c^{2}d^{2} + d^{4}.

(a^{3}+3b)^{2} = a^{6} + 6a^{3}b + 9b^{2}.