第1个回答 推荐于2016-12-02
(-1/42)/(1/6-3/14+2/3-2/7)
=(-1/42)/(1/6+2/3-3/14-2/7)
=(-1/42)/[(1/6+2/3)-(3/14+2/7)]
=(-1/42)/[5/6-1/2]
=(-1/42)/[1/3]
=-1/42*3
=-1/14本回答被提问者采纳
=(-1/42)/(1/6+2/3-3/14-2/7)
=(-1/42)/[(1/6+2/3)-(3/14+2/7)]
=(-1/42)/[5/6-1/2]
=(-1/42)/[1/3]
=-1/42*3
=-1/14本回答被提问者采纳
第2个回答 2011-08-08
分子分母同乘42就变成 -1/(7-9+28-12)= -1/14
第3个回答 2011-08-08
(-1/42)/(1/6-3/14+2/3-2/7)
=(-1)/42(1/6-3/14+2/3-2/7)
=(-1)/(7-9+28-12)
=-1/14
=(-1)/42(1/6-3/14+2/3-2/7)
=(-1)/(7-9+28-12)
=-1/14
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