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Foxyck
@Foxyck
August 2022
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Помогите решить, пожалуйста! Только не ответ, а с расписанным решением чтобы понять :с
Сократите дробь:
А) x^2+x-6/7x+21
Б) z^2-16z+63/z^2-81
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musabirowa991
А) х^2 + x - 6 = 0
a=1, b=1, c=-6
D=b^2-4ac=1+24=25
x1,2=-b+-конень из D / 2a = -1+-5 / 2
x1=2
x2=-3
х^2 + x - 6 / (21x + 7) = (x+3)(x-2) / 7(x+3) = (x-2) / 7
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musabirowa991
b) z^2 - 16z + 63 = 0
a=1, b=-16, c=63
D=b^2-4ac = 256 - 252 = 4
z1, 2 = -b +- корень из D / 2a = 16+-2 / 2
z1 = 7
z2 = 9
z^2-16z+63/z^2-81 = (z-7)(z-9)/(z-9)(z+9)=(z-7)/(z+9)
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Answers & Comments
a=1, b=1, c=-6
D=b^2-4ac=1+24=25
x1,2=-b+-конень из D / 2a = -1+-5 / 2
x1=2
x2=-3
х^2 + x - 6 / (21x + 7) = (x+3)(x-2) / 7(x+3) = (x-2) / 7
a=1, b=-16, c=63
D=b^2-4ac = 256 - 252 = 4
z1, 2 = -b +- корень из D / 2a = 16+-2 / 2
z1 = 7
z2 = 9
z^2-16z+63/z^2-81 = (z-7)(z-9)/(z-9)(z+9)=(z-7)/(z+9)