辽宁省沈阳市协作体2024-2025九年级上学期期中数学试题（图片版含答案）

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由题意得：印＝匡
"豐 .t.CDE == SS
: ,LIJ吓=90卓 9 LrOE=J 心
陬: LDC.B=90
: .L氏 II{iB _t. 区rJ·LOCFaa沁
:. LC以＝叮 - L皮G=J5"
住R.mt!,.C:研中. CD11a 盼m,
:. DF=DC s日135'" :i:>::::SOXO.:Si= 5.6 (n四）．
在R心压石中．配＝万mm.
扭G霆雪8Cood5* 彝圈 7SXO.ltl::6U (n,m},
: .DE=D.F+.U D户BG 斗5.6冲七1.5白 m01 (mm),
笞： 点D窍AB的距窝约为107叩止 .O H 暴忐．．．斗霉摹知．．华......叩..掌. 霪 ·8分
19. (日）证明：
·:cF=BE,
:. CE+BE=CE丈F.
即BC=EF,
在a ABCD中，
ADIi oc·. ..JD叩r·.
. EF=AD,
..- . 四边形AEFD是平行四边形．
又·: AE .liJC.
嘈 · L..-JECc古口 AF.FD是矩形 .. 宁 Tn宁.-, 宁一一 一...于.....宁... ·-·-- -- - 心 --- ---心志· 志·一一···j 4分
(2) ._. 四边形 一.JEFD姑矩形．
:帽. .JF=DE, 0 = -
[ ED.
噙+'OE=4-,
: .AF;;;;;; DE-- 8 嘈
住6A扣r中. ,.J fj丸1户=648:: =t炉=8户 1
九年级故孚乍仆评分标儿给3贞儿8扒
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