20-(1/2+1/3)/5/6*1.2的简便运算
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20-(1/2+1/3)/5/6×1.2
= 20-(5/6)/5/6×1.2
= 20-1/5/6
= 20-1/30
= 19 又 29/30
= 20-(5/6)/5/6×1.2
= 20-1/5/6
= 20-1/30
= 19 又 29/30
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20-(1/2+1/3)/5/6*1.2
=20-5/6×1.2/5/6
=20-(5/6×6/5)/5/6
=20-1/(5×6)
=599/30
=20-5/6×1.2/5/6
=20-(5/6×6/5)/5/6
=20-1/(5×6)
=599/30
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