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- 2I don't believe a single word he says.
- 3设数列an中的前n项的和为Sn,并且a1=1,Sn+1=4an+2,设bn=an比2的n次方,求证数列bn为等差数列
- 4A good book is often the best urn of a life enshrining the best that life could think out;
- 5our classroom has four windows的同义句
- 6圆锥和圆柱的底面积比是2:1,体积比是1;6.
- 7光速约为3×10&sup5千米,一颗恒星发出的光需要6年时间到达地球,若一年3×10&sup7秒计算,恒星与地球的距
- 8一个四边形周长是38厘米,已知第一条边长为a厘米,第二条边长比第一条边长的二倍长3厘米,第三条边长等于
- 9若集合M={x|x2+x-6=0},N={x|(x-2)(x-a)=0},且N⊆M,求实数a的值.
- 10{2.74-0.56*(2又5/12-1又19/60+2.275)}/1又3/17