2.15-(5/6-1/12) 5/17-4/51+2/3是2.15
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2.15-(5/6-1/12)5/17-4/51+2/3是2.152.15-(5/6-1/12)5/17-4/51+2/3是2.152.15-(5/6-1/12)5/17-4/51+2/3是2.152
2.15-(5/6-1/12) 5/17-4/51+2/3是2.15
2.15-(5/6-1/12) 5/17-4/51+2/3
是2.15
2.15-(5/6-1/12) 5/17-4/51+2/3是2.15
2.15-(5/6-1/12)
=2.15-(10/12-1/12)
=2.15-9/12
=2.15-3/4
=2.15-0.75
=1.4
5/17-4/51+2/3
=5*3/51-4/51+2*14/51
=(15-4+28)/51
=39/51
=13/17
是2.15 还是第2题15-~