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it looks like many,many bees__in the sky
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反证法：先假设结论的( )是正确的.从假设出发,通过推理得出( )说明假设( ),从而证明原命题结论( ).
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数学高手帮帮忙,俺是四年级的小弟,一个几何题,偶做不出来.多谢!多谢!
