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5/13×括号6/17-3/26括号乘2/3-4/17=
=5/13*6/17*2/3-5/13*3/26*2/3-4/17
=(5*2*2)/(13*17)-5/(13*13)-4/17
=20/221-5/169-4/17
=(20/221-4/17)-5/169
=(20/221-52/221)-5/169
=-32/221-5/169
=-32*13/(221*13)-(5*17)/(169*17)
=-416/2873-85/2873
=-501/2873
=5/13*6/17*2/3-5/13*3/26*2/3-4/17
=(5*2*2)/(13*17)-5/(13*13)-4/17
=20/221-5/169-4/17
=(20/221-4/17)-5/169
=(20/221-52/221)-5/169
=-32/221-5/169
=-32*13/(221*13)-(5*17)/(169*17)
=-416/2873-85/2873
=-501/2873
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