58×57/59的简便方法?
3个回答
展开全部
58x57/59=(59-1)x57/59
=57-57/59
=56又2/59
=57-57/59
=56又2/59
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展开全部
解:58x57/59
=(59-1)x57/59
=59x57/59-57/59
=57-57/59
=56又2/59
=(59-1)x57/59
=59x57/59-57/59
=57-57/59
=56又2/59
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展开全部
58x57/59
=58x(59-2)/59
=58x59/59-58x2/59
=58-(59-1)x2/59
=58-59x2/59+2/59
=58-2+2/59
=56+2/59
=58x(59-2)/59
=58x59/59-58x2/59
=58-(59-1)x2/59
=58-59x2/59+2/59
=58-2+2/59
=56+2/59
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