[2014·湖北模拟]已知等比数列{a n }中,各项都是正数,且a 1 , a 3, 2a 2 成等差数列,则 =( )
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1年前1个回答
你能帮帮他们吗
dim a(10,10) as integer for i=1 to 10 for j=1to 10 a(i,j)=i*
1年前
_____after a whole day's work that he could handly stand it.
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由方程3x-5=2x-4变形得3x-2x=-4+5,那么这是根据( )变形的.
1年前
如图,四棱锥S-ABCD底面ABCD是正方形,SA⊥底面ABCD,E是SC上一点,且SE=2EC,SA=6,AB=2.
1年前
He left home two weeks ago and we haven't heard from him__
1年前