【简答题】已知m 2 +mn+2n 2 =11,mn+n 2 =6,则m 2 +n 2 的值为( )。
【多选题】下列化合物中比苯取代反应活性强的是()。
【单选题】When playing a game you should ask your child to find something starting with the letter b instead Of c.
【单选题】When playing a game you should ask your child to find something starting with the letter b instead of c.( )
【判断题】在四拍子歌曲中,用八分音符弹奏半分解音型,是一个低音和七个双音吗?
【简答题】When playing a you should ask your child to find something starting with the letter b instead of c.
【单选题】利用配方法解方程x 2 -12x+25=0可得到下列哪一个方程( )
【简答题】计算 (1)(6a 2 ﹣8a+11b 3 )﹣(11a 2 +2b 3 ) (2)(3x+9)(6x+8) (3)(4a 3 b﹣6a 2 b 2 +12ab 3 )÷2ab (4)(x+2) 2 ﹣(x+1)(x﹣1)