x（x+1）=7 是一元二次方程,后面那个左右一消还用解吗,不清楚,一定算方程的话也只能是一元一次方程了
it is great to see you h__ is your new school america
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相关问题
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it is great to see you.中的great为什么是补语?
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the boy is happy to see these new school things
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