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2.1 或 2又1/10
=(6又1/2 * 1又3/13 - 4又1/2) / 1又2/3
=(13/2 * 16/13 - 9/2) * 3/5
=(16/2 - 9/2) * 3/5
= 7/2 *3/5
=21/10
=2.1 或 2又1/10
=(6又1/2 * 1又3/13 - 4又1/2) / 1又2/3
=(13/2 * 16/13 - 9/2) * 3/5
=(16/2 - 9/2) * 3/5
= 7/2 *3/5
=21/10
=2.1 或 2又1/10
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