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数学
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81/99^2-1/121数学题
也就是81÷99^2(平方)-121分之1
简便!
人气:412 ℃ 时间:2020-05-19 04:28:48
解答
=9²/99²-1/121
=(9/99)²-1/121
=(1/11)²-1/121
=1/121-1/121
=0
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