一道初二的数学题!!!!!!!!!!!!!!!!!!!!!急!!!~~~~

2025-01-04 11:16:35
推荐回答(5个)
回答1:

过M做AD垂线,垂足为N
∠C=90度,DM平分∠ADC
三角形DCM与DNM全等,MN=MC
因为M为BC中点
所以MN=MC=MB
∠B=∠C=90°,有公共边AM
所以直角三角形ABM与ANM全等
即AM平分∠DAB.

回答2:

“bieber_only”您好,很高兴为您解答!
解:∵a+b>=2根号下ab,且a^2+b^2>=2ab,
∴a=9,b=10时,根号下ab<=(a+b)/2=19/2。
希望我的回答对您有帮助~

回答3:

因为两个瓶子的容积相同,设为V,则第一个瓶子共有(P+1)份溶液,所以没份溶液的容积为V/(P+1),同理,则第二个瓶子共有(q+1)份溶液,所以没份溶液的容积为V/(q+1),所以当两瓶溶液混合时,酒精的容积为P*V/(P+1)+q*V(q+1),水的容积为1*V/(P+1)+1*V(q+1),所以两者之比为(2Pq+P+q)/(2+P+q)

回答4:

(1)3月份的总毛利润/每件毛利润=30000/X件
(2)成本价格不变,销售价降低了4元,只有减少毛利润,因此,4月份每件商品的毛利润是:
X-4
(3)4月份销售量比3月份增加了500件,即是:
30000/X+500
(4)4月份每件商品的毛利润*4月份销售量=(X-4)*(30000/X+500)

回答5:

听好了,先化简得X的三次方+XA+3X-2b=X的三次方+5X+4,然后你把两边的式子对起来,X的三次方=X的三次方,Xa+3X=5X(得a=2),-2b=4(得b=-2),OK。

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