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精彩回答
观察以下等式: 可以推测1³+2³+3³+…+n³=( )(用含有n的式子表示,其中n为自然数)。
1年前
Shopping habits in the United Stateshave changed greatly in the last quarter of the 20th century.
1年前
The water is too deep. I couldn't see its bottom. (用hardly改为同义句 )
1年前
You are going to high school, aren’t you?
1年前
一种电子计算机每秒可做4×10的9次方次运算,它工作5×十的二次方s可做多少次运算?
1年前