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2根号12-6根号（1/3)+3根号48
=4根号3-2根号3+12根号3
=14根号3
急求解答...越详细越好
使役动词
1.使役动词是表示使、令、让、帮、叫等意义的不完全及物动词,主要有make(使,令), let(让), help(帮助), have(叫)等。
2.使役动词后接受词,再接原形不定词作受词补语。
He made me laugh.
他使我发笑。
I let him go.
我让他走开。
I helped him repair the car.
我帮他修理汽车。
Please have him come here.
请叫他到这里来。
3.使役动词还可以接过去分词作受词补语。
I have my hair cut every month.
我每个月理发。
4.使役动词的被动语态的受词补语用不定词,不用原形不定词。
(主)He made me laugh.
他使我笑了。
(被)I was made to laugh by him.
我被他逗笑了。
使役动词有以下用法：
a. have somebody do sth让某人去做某事
??i had him arrange for a car.
b. have somebody doing sth.让某人持续做某事。
??he had us laughing all through lunch.
注意：用于否定名时，表示“允许”
i won't have you running around in the house.
我不允许你在家里到处乱跑。
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小议“使役动词”的用法
1. have sb do 让某人干某事
e.g:What would you have me do?
have sb/sth doing 让某人或某事处于某种状态，听任
e.g: I won't have women working in our company.
The two cheats had the light burning all night long.
have sth done 让别人干某事，遭受到
e.g:you 'd better have your teeth pulled out.
He had his pocket picked.
notes: "done"这个动作不是主语发出来的。
2.make sb do sth 让某人干某事
e.g:They made me repeat the story.
What makes the grass grow?
notes: I was made to repeat the story.
make sb/sth done/adj./n
e.g. The news made him happy.
He couldn't make himself heard above the noise of the traffic.
His actions made him universally respected.
He made her his wife.
3.get sb to do 使某人干某事
e.g: I can't get anyone to do the work properly.
get sth done 让别人干某事
e.g: I must get my hair cut.
Can you get the work finished in time?
4.leave sb to do sth 让某人干某事
e.g: We left him to paint the gate.
I'll leave you to settle all the business.
leave sb doing 让继续处于某种状态
e.g: Don't leave her waiting outside in the rain.
We left him painting the gate.
leave sth done/adj./prep.phrase
e.g:Please excuse me if I have left any of your questions unanswered.
His illness has left him weak.
I was left with a ray of hope.
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使役性动词（Causative Verb）
1.make /have/ let +sb +do sth.
2.get/set/leave + sb to do/doing sth.
【感官动词】
(A)感官动词(及物动词)有：
see/notice/look_at/watch/notice/observe/listen_to/hear/feel(Vt)/taste(Vt)/smell(Vt)
(B)连缀动词(含感官不及物动词)
be/get/become/feel/look/sound/smell/taste/keep/stay/seem/ appear/grow/turn/prove/remain/go/run
【用法】
一、see, hear, feel, watch, look,这五个动词均可作连系动词，后面接形容词作表语，说明主语所处的状态。其意思分别为"看/听/闻/尝/摸起来……"。除look之外，其它几个动词的主语往往是物，而不是人。
例如：
These flowers smell very sweet.这些花闻起来很香。
The tomatoes feel very soft.这些西红柿摸起来很软。
二、这些动词后面也可接介词like短语，like后面常用名词。
例如：
Her idea sounds like fun.她的主意听起来很有趣。
三、这五个感官动词也可作实义动词,除look(当"看起来……"讲时)只能作不及物动词外,其余四个既可作及物动词也可作不及物动词,此时作为实义动词讲时其主语一般为人。（和1有区别）
例如:
She smelt the meat.她闻了闻那块肉。
I felt in my pocket for cigarettes.我用手在口袋里摸香烟。
四、taste, smell作不及物动词时,可用于"taste / smell + of +名词"结构,意为"有……味道/气味"。
例如:
The air in the room smells of earth.房间里的空气有股泥土味。
五、它们(sound除外)可以直接作名词,与have或take构成短语。
例如:
May I have a taste of the mooncakes?我可以尝一口这月饼吗？
六、其中look, sound, feel还能构成"look / sound / feel + as if +从句"结构，意为"看起来/听起来/感觉好像……"。
例如：
It looks as if our class is going to win.看来我们班好像要获胜了.
急求答案、、、、、、、
1 4
2 1
3 2
4 2
5 3/4
6 3
7 3
8 1
9 1
10 4
求解答！急!
原式＝根号5除以根号11除以根号32乘以(负的根号24)
＝根号下11分之5乘以根号下32分之一乘以（负的根号24)
＝根号下11分之5乘以（负的根号下32分之24）
＝根号下11分之5乘以（负的根号下3分之4）
＝负的根号44分之15