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Y=√9-x+√x
y=√9-x+x
y=√9
область определения-[3;+бесконечность)
<span>2a^2-b(2a-b)-a(2a-5b)=2a^2-2ab+b^2-2ab+5ab=2a^2+ab+b^2</span>
0x=2
решений нет, т.к. результат произведения нуля и любого числа равен нулю, а не двум.
Ответ: ноль решений
11 / х-9 = -10
11 = -10(х-9)
11 = -10х+90
10х = 90-11
10х = 79
х = 79:10
х = 7,9