傻中傻 花朵
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∵[a/b]=[c/d]=[e/f]=[3/4]，∴[a−2c+3e/b−2d+3f]=[3/4]．故答案为：[3/4]．
点评：本题考点： 比例的性质． 考点点评： 本题考查了比例的性质，熟记等比性质是解题的关键．
1年前
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英语翻译Within seven years,21 peoleo who had something to do wit
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证明：（sin²）²a+（cos²）²a=1-2sin²acos&su
How he has done has great influence on the development of th
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