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zakatalibli
@zakatalibli
August 2022
1
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Зная, что a^2 - 2a - 6 = 0 найдите значение выражения a^3+8/2a+4
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наталияандреева
А^2-2a-6=0
D=4+24=28
a1=2+
/2=2+2
/2=1+
a2=2-
/2=2-2
/2=1-
Через a1:
(1+
)^2-2*(1+
)-6=1+2
+7-2-2
-6=1+7-2-6=0
Через a2:
(1-
)^2-2*(1-
)-6=1-2
+7-2+2
-6=1+7-2-6=0
Ответ: 0.
3 votes
Thanks 2
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Answers & Comments
D=4+24=28
a1=2+/2=2+2/2=1+
a2=2-/2=2-2/2=1-
Через a1:
(1+)^2-2*(1+)-6=1+2+7-2-2-6=1+7-2-6=0
Через a2:
(1-)^2-2*(1-)-6=1-2+7-2+2-6=1+7-2-6=0
Ответ: 0.