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He jumbled up everything in the drawer to find his key.
1年前
一个长方形的长减少5cm,宽增加2cm,所得的是一个正方形,该正方形的面积与原长方形的面积相等,设原长方形长和宽分别为xcm,ycm,以下x,y之间的等量关系式错误的是( )
1年前
Going to a British high school for one year was a very enjoyable and exciting _______ (经历) for one.
1年前
1年前
若bn=2(1-n)an(n≥2),求证:b22+b32+…+bn2<1.
1年前