解：原式=(-1/30)÷[(2/3+1/6)-(1/10+2/5)]
=(-1/30)÷(5/6-1/2)
=(-1/30)÷(1/3)
=(-1/30)×3
= -1/10
=(-1/30)÷(5/6-1/2)
=(-1/30)÷(1/3)
=(-1/30)×3
= -1/10
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第1个回答 2011-10-16
=(-1/30)÷[(2/3+1/6)-(1/10+2/5)]
=(-1/30)÷(5/6-1/2)
=(-1/30)÷(1/3)
=(-1/30)×3
= -1/10
=(-1/30)÷(5/6-1/2)
=(-1/30)÷(1/3)
=(-1/30)×3
= -1/10
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