9/25÷(4-5/12-7/12)这道题怎么算呀?
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9/25÷(4-5/12-7/12)
=9/25÷[4-(5/12+7/12)]
=9/25÷(4-12/12)
=9/25÷(4-1)
=9/25÷3
=9/25÷(3/1)
=9/25×(1/3)
=(9×1)/(25×3)
=9/3×(1/25)
=3×(1/25)
=3/25
=0.12
=9/25÷[4-(5/12+7/12)]
=9/25÷(4-12/12)
=9/25÷(4-1)
=9/25÷3
=9/25÷(3/1)
=9/25×(1/3)
=(9×1)/(25×3)
=9/3×(1/25)
=3×(1/25)
=3/25
=0.12
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