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21585a
@21585a
July 2022
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Решите с решением!!!
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sangers1959
Verified answer
(1/8)*y⁴-(7/8)*y²-1=0 I×8
y⁴-7y-8=0
y²=t≥0
t²-7t-8=0 D=81
t₁=8 t₂=-1 t₂∉
y²=8
y₁=2√2 y=-2√2
(1/144))n⁴-(25/144)n²+1=0 I×144
n₄-25n²+144=0
n²=t≥0
t²-25t+144=0 D=49
t₁=9 t₂=16
n²=9 n₁=3 n₂=-3
n²=16 n₃=4 n₄=-4.
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Answers & Comments
Verified answer
(1/8)*y⁴-(7/8)*y²-1=0 I×8y⁴-7y-8=0
y²=t≥0
t²-7t-8=0 D=81
t₁=8 t₂=-1 t₂∉
y²=8
y₁=2√2 y=-2√2
(1/144))n⁴-(25/144)n²+1=0 I×144
n₄-25n²+144=0
n²=t≥0
t²-25t+144=0 D=49
t₁=9 t₂=16
n²=9 n₁=3 n₂=-3
n²=16 n₃=4 n₄=-4.