4/15÷3又1/4+5/13×4/15+4/13÷3又3/4
1个回答
原式=4/15÷13/4+5/13×4/15+4/13÷15/4
=4/15×4/13+4/15×5/13+4/15×4/13
=4/15(4/13+5/13+4/13)
=4/15×1
=4/15
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