Question

Определите значение у, при которых верно равенство

Answer 1

$y^{2}-\frac{9y-2}{7}=0\\\\y^{2}*7-\frac{9y-2}{7}*7=0*7\\\\7y^{2}-9y+2=0\\\\D=(-9)^{2}-4*7*2=81-56=25=5^{2}\\\\y_{1}=\frac{9+5}{14}=1\\\\y_{2}=\frac{9-5}{14} =\frac{2}{7}$

Answer 2

здравствуй.

$y^2-\frac{9y-2}{7} =0\\\\y^2*7-\frac{7(9y-2)}{7} =0\\\\7y^2-9y+2=0\\D=(-9)^2-4*7*2\\D=25\\\\x1=\frac{9-5 }{14} \\\\x2=\frac{9+5 }{14} \\\\x1=\frac{2}{7} \\\\ x2=1$

удачи в учёбе.