脱式计算﹙写过程﹚ ①1-1/2-2/11

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脱式计算﹙写过程﹚ ①1-1/2-2/11
脱式计算﹙写过程﹚ ①1-1/2-2/11

脱式计算﹙写过程﹚ ①1-1/2-2/11
1-1/2-2/11
=﹙1-1/2﹚-2/11
=1/2-2/11
=11/22－4/22
=7/22