简算 2又1/17X15-(5又21/23-5又15/17
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![简算 2又1/17X15-(5又21/23-5又15/17](/uploads/image/z/1988498-2-8.jpg?t=%E7%AE%80%E7%AE%97+2%E5%8F%881%2F17X15-%EF%BC%885%E5%8F%8821%2F23-5%E5%8F%8815%2F17)
简算 2又1/17X15-(5又21/23-5又15/17
简算 2又1/17X15-(5又21/23-5又15/17
简算 2又1/17X15-(5又21/23-5又15/17
简算:
2又1/17X15-(5又21/23-5又15/17)
=(2+1/17)*15-(5+21/23-5-15/17)
=30+15/17+15/17-21/23
=30+30/17-21/23
=30+(2-4/17)-(1-2/23)
=31+2/23-4/17
=31+(34-92)/(23*17)
=31-58/391
=30又333/391