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設公差為d,公比為q M,N,P是等差數列,則可看做M,M+d,M+2d AM=a1*q^(M-1)=4 AN=AM*q^(N-M)=4q^(M+d-M)=4q^d=6即q^d=3/2那麼q^2d=9/4 那麼AP=AM*q^(P-M)=4q^(M+2d-M)=4q^2d=4*9/4=9 AP=9
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