1/2÷5/ 11 -4/ 11 +1/5的和中括号。简便方法怎样计算?
2个回答
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1/2÷(5/11-(4/11+1/5))
=1/2÷(5/11-4/11-1/5)
=1/2÷(1/11-1/5)
=1/2÷1/11-1/2÷1/5
=1/2×11-1/2×5
=11/2-5/2
=6/2
=3
=1/2÷(5/11-4/11-1/5)
=1/2÷(1/11-1/5)
=1/2÷1/11-1/2÷1/5
=1/2×11-1/2×5
=11/2-5/2
=6/2
=3
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