GRE考试105道数学易错难题

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1、1ஹn
ᦪᑮᜧ᣸ᑡ(n-l)/4,ᖪi,ᦪj,ᑣ1stQuartile:(i+1
ᦪ)*(4-j)/4+(i+2
ᦪ)*j/42ஹ4
*,2
•Ḅ᣸ᑡ15(=)3ஹ5!"2#$%&'Ḅᭆ᳛஺1/94.40+,French,60+,Russian,80+,Italy,,-./0Ḅᨵ50+,2./0Ḅᨵ10+ᐳᨵ125+45,67/0Ḅᨵ8+஺Key:125-(40+60+80-50-10*2)=155ஹ9Ὺ;<2<=>?2@2A᪷C2,☢E஺6,F.GHIJ125gra

2、mperliter,Kᣚᡂouncepergallon,⊤O஺PQ1ounce=28.xxxgramand1gallon=3.875liter7ஹx,y,zᙳSd,x+10,y+10,z+10ḄᙳS(d)8ஹ1Ḅᭆ᳛T0.8,2Ḅᭆ᳛T0.6,4T1ᡈT2ᡈTbothḄᭆ᳛1-0.6*0.8(ᦪVWX)=0.929ஹYZ[ᦪ]^12.1_mean`1.5
᪗bS17.5_meanc3.0
᪗bS,4meanTde஺13.9(᪗bSX12.1+1.5X=M,17.5-3X=M)10ஹf⊤⚪h1992ijkT50,96iT60,limen?1,oᨬᜧḄin?q7.011ஹx+y

3、=5&2x+2y=8roᨬstuv1_w<112ஹx40miles/houryJz{YL5milesḄ

4、,}~yᑣfine=50+(yJ-40)*10,Y+ᵨ108{

5、4᝛Ḅfine=?key15013ஹxyztogetherfinishthetaskfor9hour,xytogatherneed12hour,zaloneneeds?hour,key3614ஹ;I,ᙠXtT3,ᙠYtT4஺;m.ᙠXtT4,ᙠXtT3஺_-
;Ḅsloop஺m>l15ஹYᚮ6
F4
ᐳᨵ15.5Ḅ᝞8
☢4
_6
☢dde.q16ஹY
⊤3ᑖ᠒Y4

6、᠒3ᑖ⌕{deᑖ.q540ᑖ17ஹ3/0.0001v3/0.000099_ᜧ18ஹᙠY
f⊤⚪ὃᑮmediano6⚪_w5%T¡ᦪV⚪஺Tᨵᐵ⌱¤⌱¥Ḅ_¦-ᙽ¨¨©ªfY¨T«⌱+x,yḄ¬ᢝ᳛®YᙽT⌱¤¯Ḅᦈᐭincome஺f^ᦈᐭe²3000Ḅ⌱¤ᨵ58%,ᡠx,⌱¤ᦈᐭmedianᙠᦈᐭe²3000Ḅ☢஺19ஹᨵY⚪4´☢6
ᦪµ¶Ḅᨬ2Ḅᨬᜧ·ḄfactorTdeq2¸5
12+10
18¸6
,ᢣᦪ5T6
5{ºT6
º஺20ஹ1-10^⌱¶-
ᦪ»¼4TTᏔᦪḄᭆ᳛஺3/421ஹ¾50+50*X%
80+80*X%
-50*80=5400,X22ஹaZ8,

7、9,10,11,12,bZ25,26,27,28
4ᔜÀ¶Y
-
ᦪÁ@Â8.ÃÄq823ஹY
-Åᦪn,ᓝÅᦪTU,
ÅᦪT5,ᨵY⊤OTE=n¸2-25
/100,ᵨU⊤OE«KEYhQ⍝n=10*U+5,ᐸÉÊeasy஺24ஹ2
R=1Ḅᙊ--Áᑗ2
ᑗÍA,B,C¾ᨵfÎÏ42ÐÑÒ¾?ḄÓÐf^ÔÕÏAB,BC,ABrk25ஹYÖ>=4,5,12,x¾×Ø┐Ï4xḄÚÜ஺326ஹ1²100ḄÝ᦮ᦪ¶-
akb,_wakbTᏔᦪḄᭆ᳛ka+bTᏔᦪḄᭆ᳛Ó
ᜧq5ᵨßa+bTᏔᦪḄ!᎛akbxT᜻ᦪᡠxâὅᜧ஺27ஹMkRTÜᡂY
ᙌḄn
+^Ḅ2

8、67+^ÀY
^ᝄ4Rា%ᙠMç>Ḅᭆ᳛kR^ᝄḄᭆ᳛_ᜧl/n-l,l/n
28ஹFᱥéê20$,ëê30%,ᙠìẠîïëê20%,4ê஺20*0.7*0.8=11.229ஹðñò6·óôᐸnumberofoutcomek18õö_w30ஹ÷øY
cubeḄ⊤☢Eᕜ?31ஹY
2<=2ᩩ;Ḅᙶ᪗ü¶4<Jᨬâ߶TY
;<2<=32ஹüýY
>?3Ḅ2<=þý_wvᐸÉ8
f=Ḅ☢Eÿ
஺33ஹ4ṹ3
x
k,ᡂṹḄ
ᦪ3p,e,sᡂṹḄ
ᦪ஺34ஹ4


9、ᳫ2
ᳫ

⁐Ḅᭆ᳛"+=(4/6)(2/5)+(2/6)(1/5)=1/335ஹN>4,N~2-6N+8N~2-6N+936ஹPl,P2