若∠1+∠2=90°,∠2+∠3=90°,则∠1与∠3的关系是____ .,理由是____ .
17-18七年级上·辽宁营口·期末 查看更多[8]
更新时间:2019-09-06 20:24:08
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【推荐1】已知∠α的补角为87°48′,则∠α的度数为_________ .
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