Ответы на вопрос:
(9m-8n)^2-(8n+9m)^2=81m^2-144mn+64n^2-(64n^2+144mn+81m^2)=81m^2-144mn+64n^2-64n^2-144mn-81m^2= -288mn
1.
{9+x > = 0; x > = -9
{9+x < 16
x < 7
x€[-9; 7)
2.
{1+x > = 0; x > = -1
{1+x < 4
x < 3
x€[-1; 3)
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