---Do you know whose dictionary it is?----It()Li Lei's.His name is on it.

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• ---Do you know whose dictionary it is?----It()Li Lei's.His name is on it.---Do you know whose dictionary it is?---It()Li Lei's.His name is on it.A.can beB.must be C.may be D.might be
• Do you know whose dictionary it is?---It()Li Lei's.His name is on it.
• ---Do you know whose dictionary it is?----It()Li Lei's.His name is on it.
• 设X1=1,Xn=1+X（n-1）/[1+X(n-1)],证明Xn在n趋向于无穷大时极限存在,并求其值
• 用公式法解下列方程":(1) x^2+x-12=0 (2) x^2-√2x-1/4=0 (3) x^2+4x+8=2x+11 (4)x(x-4)=2-8x