2个回答
展开全部
1/55÷1/7+54/55*7
=1/55*7+54/55*7
=7/55(1+54)
=7/55*55
=7
=1/55*7+54/55*7
=7/55(1+54)
=7/55*55
=7
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展开全部
1/55÷1/7+54/55×7
=1/55×7+54/55×7
=7×(1/55+54/55)
=7×1
=7
=1/55×7+54/55×7
=7×(1/55+54/55)
=7×1
=7
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