5-10分之1乘2分之3除8分之3 5分之4乘3分之2+3分之1除4分之5

5-10分之1×2分之3÷8分之3
=5-1/10x3/2x8/3
=5-1/10x4
=5-0.4
=4.6
6÷5分之3－6分5×0.3
=6x5/3-5/6x3/10
=10-1/4
=9又3/4
5分之4×3分之2+3分之1÷4分之4
=8/15+1/3
=8/15+5/15
=13/15

右：上下腔静脉→右心房→右心室→肺动脉,流静脉血
左：肺静脉→左心房→左心室→主动脉,流动脉血
相信你了

方法一：
在圆上任取一点A,以A为心,原半径r为半径连续画弧,交圆O于B,C,D,E.连ACE即得.
方法二：
画直径AB.以A为心,AO为半径,画弧交圆O于C,D二点.连CBD.
方法三：
画直径AB.分别以A、B为心,AB长为半径,画弧交于C.连AC,BC分别交圆于D,E.直线DO交圆于F.连AEF即得.
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没有图 不好意思……
我也马上就要做作业了……来不及搞图了……

5 - 10/27
= 135/27 - 10/27
= 125/27
根据x^3=125,x^3=27
得125/27的立方根是5/3

in recent years,the safety of food has brought into focus.such as the SANLU milk powder,the crayfish, the dyeing steamed bread and the SHUANGHUI fresh meat. as the unsafe events of food occuring one by one,people are worry【worried】 about the safety of food from now on.
as far as i am concerned,there are many reasons result【resulting】 in the food unsafety.first of all,most of businessman 【businessmen】are just concerned about the profit of their productions【products】.in order to gain the higgest【highest】 profit, they add some harmful chemicals into the productions【products】. what is more,they prefer the lowest prise raw materials rather than the highest qualify one.so they can take less money to【and】 make highest profit. finally,withoutf the perfect management of goverment departments , the unsafe events of food can happen usually.
considering these, i think we should take series of measures to stop this kind of event from happening.i put forward the following suggestions.for one thing, our goverment departments should put forward the effective measures to control this kind of event again. for another thing,as businessmen, we【they】 can just think of the profit,we 【they】have a responsibility to ensure the satefy of productions

1、Is that your dictionary?
2、What is these in English.

小溪,没有江水的波澜壮阔,没有河水的宽广宏伟,却用他最终的归宿昭示着－－什么是奋斗!

【With】 the developing of technology ,telephone has been used all over the world. 【When people ask which is the 【best 改为better】way to contact with others, telephone or letter? 【Different 】people have different answers. 【Most】 people choose the former while others choose the 【later——latter】.
【the people--Those】 who hold the first opinion believe that contacting by telephone is more 【convenience-convenient】 than【contacting】 by letter. 【Especially 】the mobile phone, you can contact with others by 【is-it】 whenever and wherever you want【to】. 【However ,others who choose the 【later--latter】 opinion may think that it can save much money 【on contacting ---to contact 】by letter than by telephone. 【and——What's more】, some people are shy to express their 【mind--feelings 】【to-for】 others 【by-in】 【the-a】 【directing -direct】way ,such as telephone. 【For 】example , as girls, they【are】 usually shy to show their love to boys face to face 【and-or】 by telephone. 【Most】 of them prefer to show their love by【 the去掉 】letter.
【In】 my eyes, the two choices have their own advantages.whichever choice one makes,he has his own reasons.【After】 weighting up these two choices,I think I will contant with others by telephone in most 【time—cases】, but 【sometime-sometimes】I will choose the letter too.很多处是大小写的改动.得分嘛,11——12分.细小的失误有点多.建议：有时读练结合、读背结合效果可能更好.

Fast food is the food that can help people save time and energy.especially for the those who keep busy all the time.
Why is it called fast food?Because it can be prepared fast and you can buy it fast and you can eat it fast.But because it is too fast,it is not so healthy as those foods we have in normal way.
So,i think we can have the fast food when we are in a hurry or just when we want something else for change.
So,i think fast food should never be the main food for us.
And as a matter of fact,i love chinese food best.As it is both delicious and healthy.

海上明月共潮生。。前不见古人。。

答案是：
1.6:30
2.46
3.8.5

1.第一段：
(1) why so many children become single parent children?改为why so many children become single-parent children?
(2)because one of their parents had died or their parents had divorced.改为because one of their parents have died or their parents have divorced.
2.第二段
第一行的bring改成bring about
第二行的unbalance改为unbalanced
第三段、
第一行：as far as I concerned改为as far as I am concerned
第二行：single parent children改为single-parent children
第三行：both of the physical and mentally development改为both physically and mentally
第四行：when they face some problems on study or in daily life 改为when they face some problems in study or daily life