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My grandparents don't like to live in the ________ city. They like the peaceful countryside.
1年前
I found it was a bit ______ (具有挑战性的) for me.
1年前
If you need physical __________(strong), you need to wear red clothes.
1年前
已知函数f(x)=2x^2/(1-x)^2 (1)求f(x)的单调区间与极值 (2)求曲线y=f(x)的凹凸区间与拐点
1年前
inf{f(x)+g(x)}小于等于inff(x)+supf(x)
1年前