-1/42除以(1/6-2/7 2/3) (1/6-2/7 2/3)除以(-1/42)
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-1/42÷(1/6-2/7+2/3)
=-1÷(1/6x42-2/7x42+2/3x42)
=-1÷(7-12+28)
=-1÷23
=-1/23
(1/6-2/7+ 2/3)除以(-1/42)
=(1/6-2/7+2/3)x(-42)
=-1/6x42+2/7x42-2/3x42
=-7+12-28
=-23
=-1÷(1/6x42-2/7x42+2/3x42)
=-1÷(7-12+28)
=-1÷23
=-1/23
(1/6-2/7+ 2/3)除以(-1/42)
=(1/6-2/7+2/3)x(-42)
=-1/6x42+2/7x42-2/3x42
=-7+12-28
=-23
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