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)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)原式=35/17X15-(

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)
原式=35/17X15-(5+21/23-5-15/17)
=35/17X15-21/23+15/17
=35×15/17+15/17 -21/23
=15/17×(35+1)-21/23
=540/17-21/23
=12063/391

都先拆开后
等于2X15+5-5+15/17+15/17-21/23
等于30+30/17-21/23