一道数列推理题:8/9,-2/3,1/2,-/3/8( )
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![一道数列推理题:8/9,-2/3,1/2,-/3/8( )](/uploads/image/z/369382-22-2.jpg?t=%E4%B8%80%E9%81%93%E6%95%B0%E5%88%97%E6%8E%A8%E7%90%86%E9%A2%98%EF%BC%9A8%2F9%2C-2%2F3%2C1%2F2%2C-%2F3%2F8%28+%29)
一道数列推理题:8/9,-2/3,1/2,-/3/8( )
一道数列推理题:8/9,-2/3,1/2,-/3/8( )
一道数列推理题:8/9,-2/3,1/2,-/3/8( )
(-2/3)/(8/9)=-3/4
(1/2)/(-2/3)=-3/4
(-3/8)/(1/2)=-3/4
所以()/(-3/8)=-3/4
所以()=9/32
这是个等比数列,公比为-3/4,所以后面填-3/8*(-3/4)=9/32