请帮我做下面的题 如图,∠C=90° ,AC=3 ,BC=4 ,AD=12 ,BD=13 ,是判断△ABD的形状,并说明理由_百度作业帮
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请帮我做下面的题 如图,∠C=90° ,AC=3 ,BC=4 ,AD=12 ,BD=13 ,是判断△ABD的形状,并说明理由
如图,∠C=90° ,AC=3 ,BC=4 ,AD=12 ,BD=13 ,是判断△ABD的形状,并说明理由
直角三角形,因为∠C=90° ,AC=3 ,BC=4 ,所以AB=5又因为AD=12 ,BD=13 ,构成勾股定理,13的平方=12的平方+5的平方
直角三角形
用勾股定理证明
在三角形ABD中
AB的平方+AD的平方=BD的平方
(手机发送只能这样写了)帮我做一下这些题吧~谢谢_英文翻译吧_百度贴吧
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帮我做一下这些题吧~谢谢收藏
快试试吧，可以对自己使用挽尊卡咯~◆◆
本套作业共20道小题，满分为20分，及格分数12分&&&&
时间限制为：30分钟&&&已经使用时间：&&&&&
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一、Vocabulary&and&structure&&&&(一共10题，每题1分。)&&&
&&&1．&【70592】&He&must&have&been&very&nervous&when&speaking.&Did&you&_____&that&his&hand&was&shaking?&
A．&mind
B．&notice
C．&attention
D．&concentrate
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&&&2．&【70750】&In&stores&a&number&of&delicious&puddings&are&_____&out&in&a&row&during&the&Christmas&season.
A．&lied
B．&laid
C．&lain
D．&layed
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&&&3．&【70774】&He&was&in&_____&for&having&been&caught&in&the&act&of&stealing&goods&from&the&supermarket.
A．&danger
B．&disgrace
C．&debt
D．&disguise
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&
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&&&4．&【70859】&_____&with&the&corresponding&period&of&last&year,&the&output&of&chemical&fibers&in&the&first&quarter&rose&by&15%.
A．&Comparing
B．&To&compare
C．&Compared
D．&Compare
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&
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&&&5．&【70860】&Since&taxi&fare&in&the&city&may&run&_____&twenty&dollars,&I&suggest&that&you&take&a&bus.
A．&as&high&as
B．&as&expensive&as
C．&so&high&that
D．&so&expensive&as
&
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&&&6．&【70864】&While&she&was&shopping,&she&kept&_____&the&list&to&make&sure&she&hadn't&forgotten&anything.
A．&checked
B．&checking
C．&to&check
D．&check
&
&
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&&&7．&【70870】&Everything&on&the&earth&_____&all&the&time.
A．&is&changing
B．&is&changed
C．&has&changed
D．&has&been&changed
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&&&8．&【70930】&Hearing&my&words,&the&old&man&jumped&back&as&if&he&_____.
快试试吧，可以对自己使用挽尊卡咯~◆◆
A．&was&stung
B．&had&stung
C．&stung
D．&had&been&stung
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&&&9．&【81266】&Uncle&Dick&has&already&arrived.&Do&you&expect&_____&to&see&him?
A．&going
B．&go
C．&to&go
D．&that&you&go
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&&&10．&【81268】&It's&important&to&_____&time&for&relaxation&as&well.
A．&set&forth
B．&set&before
C．&set&aside
D．&set&about
&
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二、Dialogues&&&&(一共10题，每题1分。)&&&
&&&1．&【71172】&--&Hello.&I'd&like&to&speak&to&Mr.&Reynolds.&
--&_____.
A．&I'm&sorry&he's&not&in&right&now
B．&No,&you&can't
C．&Sorry,&you&can't
D．&Ok,&go&on
&
&
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&&&2．&【71173】&--&I'm&trying&to&contact&a&friend&Fred&Ashley.&
--&_____.
A．&I&don't&know&him
B．&Wrong&number
C．&Just&a&moment
D．&I&see
&
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&&&3．&【71178】&--&Could&you&connect&me&with&the&reservation&office?&
--&_____.
A．&Yes,&I&can
B．&Hold&the&line&a&minute.&I'll&connect&you
C．&Excuse&me,&I&am&busy
D．&It&doesn't&matter
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&&&4．&【71181】&--&I'd&like&to&make&a&collect&call&to&352-3558.&
--&_____.
A．&Who&shall&I&say&is&phoning?
B．&And&you&are?
C．&Who&are&you?
D．&Who&is&speaking?
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&&&5．&【71186】&--&Would&you&mind&changing&seats&with&me?
--&_____.
A．&Yes,&you&can
B．&Of&course.&I'd&like&to
C．&No,&I&don't&mind
D．&Certainly,&please&do
&
&
快试试吧，可以对自己使用挽尊卡咯~◆◆
&&&&
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&&&6．&【71207】&--&I'd&better&be&going.&
--&_____
A．&You&sure?
B．&So&soon?
C．&Why&not?
D．&Really?
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&&&7．&【71217】&--&Do&you&mind&if&I&join&you?
--&_____.
A．&I'm&very&happy&to&do&so
B．&Never&mind
C．&Please&do
D．&Oh,&I&can't
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&&&8．&【71219】&--&Congratulations&on&your&success
--&_____
A．&Thank&you&very&much.
B．&Oh,&no,&no.
C．&No,&I&didn't&do&very&well.
D．&Sorry,&I&couldn't&be&any&better.
&
&
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&&&9．&【71226】&--&May&I&see&your&tickets,&please?
--&_____.
A．&No,&you&can't
B．&Yes,&you&can
C．&Here&they&are
D．&Why&is&that?
&
&
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&&&10．&【74065】&--&Mary,&this&is&Joe's&brother&David.&
--&_____
A．&I'm&very&glad&to&meet&you.
B．&Really?
C．&Hello!
D．&Are&you&ok?
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为兴趣而生，贴吧更懂你。或好心大哥帮我做做下面几题!1）35,7,5,（）,25/7 1 B 75 C 3 D 5/72）124,,（） 7084 B 71428 C 81632 D 918363）已知A数比B数大75%,那么B数比A数小多少?20% B 25% C50% D3/74）如果2斤油可换5斤肉.7斤肉可换12斤鱼,10斤鱼可换21斤豆,_百度作业帮
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有人能帮我做一下下面的题目吗Passage 69:Something about EnglishmenIn England,people don’t usually talk very much.You can go on a bus,or in a train,and everyone sits looking out of the window.They often read.They read books and papers.But they don’t talk much.When
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