计算:
=______________ .
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2018·黑龙江哈尔滨·三模 查看更多[5]
黑龙江省哈尔滨十七中学2018届九年级三模数学试题哈尔滨市十七中2017—2018下学期初四校级三模数学试题(已下线)【万唯原创】2015年河南省中考数学押题冲刺-第一部分命题点1~5黑龙江省哈尔滨市第六十九中学2022-2023学年上学期九年级开学考试数学试卷16.2 二次根式的乘除 课后作业B层
更新时间:2018-06-14 09:46:30
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【推荐1】如图,在
中,
,
,
,以点
为圆心,
的长为半径作弧交
于点
,分别以点B,D为圆心,大于
的长为半径作弧,两弧交于点
,连接
并延长交
于点
,则
的长为____ .
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【推荐2】我国古代数学家秦九韶在《数书九章》中记述了“三斜求积术,即已知三角形的三边长,求它的面积.用符号表示即为:
(其中
,
,
为三角形的三边长,
为面积).则
,
,
时的三角形的面积为________ .
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