题目内容
已知9n+32n-1=8,求(33n)2-6×92n的值.
∵9n+32n-1=8,
∴32n+32n•
=8,
∴32n(1+
)=8,
∴32n=6,
∴(33n)2-6×92n=(32n)3-6×(32n)2=63-6×62=0.
∴32n+32n•
| 1 |
| 3 |
∴32n(1+
| 1 |
| 3 |
∴32n=6,
∴(33n)2-6×92n=(32n)3-6×(32n)2=63-6×62=0.
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