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S10：S5
=[a1(1-q^10)/(1-q)]：[a1(1-q^5)/(1-q)]
=(1-q^5)(1-q^5)/(1-q^5)
=1+q^5=1:2
q^5=-1/2
S10：S5
=[a1(1-q^15)/(1-q)]：[a1(1-q^5)/(1-q)]
=(1-q^5)(1+q^5+q^10)/(1-q^5)
=1+q^5+q^10
=1-1/2+1/4
=3:4
=[a1(1-q^10)/(1-q)]：[a1(1-q^5)/(1-q)]
=(1-q^5)(1-q^5)/(1-q^5)
=1+q^5=1:2
q^5=-1/2
S10：S5
=[a1(1-q^15)/(1-q)]：[a1(1-q^5)/(1-q)]
=(1-q^5)(1+q^5+q^10)/(1-q^5)
=1+q^5+q^10
=1-1/2+1/4
=3:4
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