概要:由△∽△,得.再由△∽△得.由勾股定理可知,,则,可得,则∠∠∠,所以tan∠tan∠.25.解:在Rt△中,∠,,∵ 上一页 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] 下一页
华师大版初三上册数学期末试卷及答案,http://www.jdxx5.com由△∽△,得.
再由△∽△得.
由勾股定理可知,,则,可得,
则∠∠∠,所以tan∠tan∠.
25.解:在Rt△中,∠,,
∵
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