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简便计算9/13x7/11+7/13x2/11
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简便计算9/13x7/11+7/13x2/11
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答案和解析
9/13x7/11+7/13x2/11
=9/11x7/13+7/13x2/11
=（9/11+2/11）x7/13
=1x7/13
=7/13
=9/11x7/13+7/13x2/11
=（9/11+2/11）x7/13
=1x7/13
=7/13
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