1、在一個(gè)比例式中,兩個(gè)外項(xiàng)都是質(zhì)數(shù),他們的積是39,其中一個(gè)內(nèi)項(xiàng)是這個(gè)積的20%,這個(gè)比例式可以寫作
13:5=(39/5):3
2、分?jǐn)?shù)的分子、分母之和是38,吧分母各加上3,分子母的比是4：7,原分?jǐn)?shù)是
解題過程如下：
假設(shè)這個(gè)分?jǐn)?shù)的分子為a,分母為b
根據(jù)題意：a+b=38……（1）
(a+3)/(b+3)=4/7……（2）
由（1）可得：b=38-a,代入（2）中得：
7(a+3)=4(38-a+3)
解方程得：a=13,b=25
所以這個(gè)分?jǐn)?shù)為13/25
3、王爺爺以每千克0.8元的價(jià)格購(gòu)回一批蘋果,經(jīng)過挑選,把這批蘋果分成了甲乙兩等,甲乙兩等的質(zhì)量比3：5；乙等只能以0.7的價(jià)格出售,王爺爺也想要獲得25%的利潤(rùn),甲等蘋果每千克應(yīng)該賣多少錢?
甲等蘋果每千克賣x元
3x+5*0.7=8*0.8(1+25%)
3x+3.5=8
3x=4.5
x=1.5
甲等蘋果每千克賣1.5元
about yellow treefourturn
[au] cow (ow)about(ou)
[?u]coat(oa)yellow(ow)
[i:] team(ea)tree(ee)
[c反過來(lái):] floor (oo)four(our)
[?:] bird(ir)turn(ur)
5、單項(xiàng)選擇
______her name?Her name is Lucy.
A.What'sB.WhereC.Who's D.Which
A
Let______look after this cat.
A.he B.hisC.he'sD.him
let 是動(dòng)詞,后加賓語(yǔ)用him 所以是D
6、
S:Good morning!Can I _help____you?
M:Yes,please.I'd __like___some apple.
S:What kind _would____you like?
M:I'd like some apples from Shandong.
S:OK.Look,these apples are big and red.
M:Yes,I think so.They're nice.__Give___me two kilos.
S:OK.__Anything____else?
M:Yes.Your fruit is cheap today I want to __buy____ some pears from Tianjin too.
S:___How__many do you want?
M:Three kilos. How much do all they__cost____?
S:Let me see. That comes to twenty-two yuan.
M:__Here's____the money.
S:Thank you and here's your_change_____.