Ответы на вопрос:
Пошаговое объяснение:
0\\-10+1.5*(n-1)>0\\-10+1.5n-1.5>0\\1.5n>10+1.5\\1.5n>11.5\\n>7\frac{2}{3} \\" class="latex-formula" id="TexFormula2" src="https://tex.z-dn.net/?f=a1%3D-10%5C%5Ca2%3D-8.5%5C%5Cd%3Da2-a1%3D-8.5-%28-10%29%3D-8.5%2B10%3D1.5%5C%5Ca_n%3Da_1%2B%28n-1%29%2Ad%5C%5Ca_1%2B%28n-1%29%2Ad%3E0%5C%5C-10%2B1.5%2A%28n-1%29%3E0%5C%5C-10%2B1.5n-1.5%3E0%5C%5C1.5n%3E10%2B1.5%5C%5C1.5n%3E11.5%5C%5Cn%3E7%5Cfrac%7B2%7D%7B3%7D%20%5C%5C" title="a1=-10\\a2=-8.5\\d=a2-a1=-8.5-(-10)=-8.5+10=1.5\\a_n=a_1+(n-1)*d\\a_1+(n-1)*d>0\\-10+1.5*(n-1)>0\\-10+1.5n-1.5>0\\1.5n>10+1.5\\1.5n>11.5\\n>7\frac{2}{3} \\">
Округляем n до целого числа n=8
проверяем
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