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数学
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已知:a+ 1/a =8,求 a^2+ 1/a^2
( a加上 a分之1等于8,求 a的2次方加上 a的2次 方分之1)
,,55,最好有过程的,
人气:208 ℃ 时间:2020-02-18 23:49:52
解答
(a+1/a)^2=a^2+ 1/a^2 +2a 1/a=64+2=66
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