the best thing to start your day is a good breakfast 与在start前不加to有什么区别

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• the best thing to start your day is a good breakfast 与在start前不加to有什么区别
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• 设abcd为互不相等的实数 且(a^2-c^2)(a^2-d^2)=1 (b^2-c^2)(b^2-d^2)=1 则a^2b^2-c^2d^2=