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С(sh)W(xu)}͡

r(sh)g2024-07-06 15:29:29 С ҪͶ
  • P(gun)]

2017С(sh)W(xu)}͡R

͞ҏ(qing)]ЩС(sh)W(xu)ԇ12}а֪R(sh)+EɌW(xu)+}λL(zhng)ӛÞW(xu)ղ!

2017С(sh)W(xu)}͡R

1.Ͳ(wn)}:

֪ɔ(sh)ĺc@ɂ(g)(sh)

P(gun)}

֪ɔ(sh)102@ɂ(g)(sh)

E

ͼϲԽԽ;2Ǵ;͜pȥԽpԽС;2С

Et

(sh)=(10+2)/2=6

С(sh)=(10-2)/2=4

2.Ȇ(wn)}:

P(gun)}

ה(sh)Ҕ(sh)12Ҽ:=74ɔ(sh)

E

ҵı(sh)

ӌ(sh)Hĸ(sh)

һԸԵı(sh)ɔ(sh)

һ12/(7-4)=4

Լה(sh)飺4X7=28Ҕ(sh)飺4X4=16

3.g(wn)}:

P(gun)}

С܊8 qְֽ34qְֵgС܊3?

E

q(hu)׃ͬr(sh)Ӝp

q(sh)һ׃(sh)Ҳ׃

ץס@c(din)һж(jin)

q(hu)׃Ěq(sh)c(din)34-8=26

Ȼ(hu)׃

֪(sh)D(zhun)Ȇ(wn)}

26/(3-1)=13

ְֵg13X3=39q

С܊g13X1=13qԑ(yng)ԓ5

P(gun)}

13qܵܽ9q(dng)܂zq(sh)ĺ40qr(sh)˸(yng)ԓǶٚq?

q(hu)׃Ěq(sh)13-9=4

Ҳ(hu)׃

q(sh)40q(sh)4

D(zhun)Ͳ(wn)}

t

Ěq(sh)(40+4)/2=22

ܵܵĚq(sh)(40-4)/2=18

Դ9

4.ͱȆ(wn)}:

֪w󲿷֡

P(gun)}

ұ(sh)͞27::=2:3:4ұ(sh)

E

Ҫ˺ּԭt

ĸȔ(sh)Լġ

ͳԱԓõ

ĸȔ(sh)ͣĸ飺2+3+4=9;

Լtұ(sh)ռ͵ıքe

2/93/94/9

ͳԱt

מ27X2/9=6

Ҟ27X3/9=9

27X4/9=12

5.uͬ\(wn)}:

P(gun)}

uͬ\^36 _120uÔ(sh)

E

O(sh)ȫuO(sh)ȫ

ˎֻ_ˎֻ?

_IJuÔ(sh)

Õr(sh)O(sh)ȫu

tӔ(sh)=(120-36X2)/(4-2)=24

ur(sh)O(sh)ȫ

tu(sh) =(4X36-120)/(4-2)=12

6.·̆(wn)}:

(1)(wn)}

P(gun)}

҃ˏ120ǧ׵ăɵ׵ٶȞ40ǧ/Сr(sh)ҵٶȞ20ǧ/Сr(sh)ٕr(sh)g?

E

һ·ȫ^(gu)

ٶȺͰѕr(sh)g

һ̣·ȫ^(gu)^(gu)·̺ǡǃɵصľx120ǧٶȺͣͰѕr(sh)g҃˵ĿٶȞ˵ٶ֮40+20=60(ǧ/Сr(sh))ĕr(sh)g͞120/60=2(Сr(sh))

(2)׷(wn)}

P(gun)}

ܶˏļȥ(zhn)ϣ㲽ٶȞ3ǧ/Сr(sh)2Сr(sh)ܵT܇l(f)ٶ6ǧ/Сr(sh)וr(sh)׷?

E

B(nio)ҪwS׷

ߵ·̣ٶȲr(sh)g(du)

ߵ·̣3X2=6(ǧ)

ٶȵIJ6-3=3(ǧ/Сr(sh))

׷ϵĕr(sh)g6/3=2(Сr(sh))

7.Ȇ(wn)}:

(1)ˮϡ

P(gun)}

20ǧ˝Ȟ15%ˮˮǧ˺׃?yu)?0%?

E

ˮˮ

ˮpˮǼˮ

ˮ

ԭ(li)Ǟ飺20X15%=3(ǧ)

ˮ

3ǧ10%‘(yng)жˮ

3/10%=30(ǧ)

ˮpˮˮpȥԭ(li)ˮ

30-20=10(ǧ)

(2)ǝ⻯

P(gun)}

20ǧ˝Ȟ15%ˮǶǧ˺׃?yu)?0%?

E

ˮˮˮ

ˮpˮ}

ˮ

ԭ(li)ˮ飺20X(1-15%)=17(ǧ)

ˮˮ

17ǧˮ20%‘(yng)жˮ

17/(1-20%)=21.25(ǧ)

ˮpˮ

ˮٜpȥԭ(li)ˮ

21.25-20=1.25(ǧ)

8.̆(wn)}:

P(gun)}

һ(xing)̣׆Ϊ(d)4҆Ϊ(d)6ͬr(sh)2҆Ϊ(d)?

E

̿O(sh)11ԕr(sh)gǹЧ

Ϊ(d)r(sh)ЧԼģ

һRr(sh)ЧDZ˵Чʺ

1pȥѽ(jng)ıǛ](mi)

](mi)ijԹЧʾǽY(ji)

[1-(1/6+1/4)X2]/(1/6)=1()

9.ֲ(sh)(wn)}:

E

ֲ(sh)ٿҪ(wn)·?

ֱĜpȥ1AǽY(ji)

P(gun)}

1һlL(zhng)120׵R·ֲ(sh)g4ֲ(sh)ٿ?

·ֱģtֲ(sh)120/4-1=29()

2һlL(zhng)120׵ĈAλ߅ֲ(sh)g4ֲ(sh)ٿ?

·LjAģtֲ(sh)120/4=30()

10.ӯ̝(wn)}:

E

ȫӯȫ̝ĜpȥС;

һӯһ̝ӯ̝һ

ԷIJ

Y(ji)ǷĖ|ˡ

P(gun)}

1Сѷÿ10(g)9(g);ÿ8(g)7(g)жСѶ?

һӯһ̝tʽ飺

(9+7)/(10-8)=8()

(yng)Ӟ8X10-9=71((g))

2ʿӏÿ45l(f)t680l(f);ÿ50l(f)t200l(f)ʿӏ?

ȫӯ(wn)}tĜpȥСʽ飺

(680-200)/(50-45)=96()

(yng)ӏ96X50+200=5000(l(f))

3W(xu)l(f)ÿ10t90;ÿ8 t8ٌW(xu)ٕ?

ȫ̝(wn)}tĜpȥСʽ飺

(90-8)/(10-8)=41()

(yng)41X10-90=320()

11.(sh)(wn)}:

P(gun)}

r(sh)犬F(xin)ڱʾĕr(sh)g18c(din)D(zhun)1990Ȧǎc(din)?

E

(sh)(N-1)(g)

С1(N-1)

׃r(sh)ҪֻҪ

D(zhun)һȦ1Сr(sh)D(zhun)24ȦǕr(sh)D(zhun)1ȦҲǕr(sh)ᘻصԭλ1980/24(sh)22ஔ(dng)ڷǰD(zhun)22(g)ȦǰD(zhun)22(g)Ȧஔ(dng)ڕr(sh)ǰ22(g)Сr(sh)r(sh)ǰ22Сr(sh)Ҳஔ(dng)24-22=2(g)Сr(sh)ஔ(dng)ڕr(sh)2Сr(sh)r(sh)ஔ(dng)18-2=16(c(din))

12.ţԲ݆(wn)}:

E

ÿţÿijԲO(sh)Ƿݔ(sh)1A^BijԲǎ?M^NijԲǎ?ĜpȥСԶߌ(du)(yng)씵(sh)IJֵY(ji)DzݵL(zhng)ʡԭеIJ˷

ʽA^BijԲpȥBԲݵL(zhng)δ֪Բţ֞ɂ(g)֣һСȳ²ݣ(g)(sh)Dzݵı;еIJʣţ(sh)͌Ҫ씵(sh)֪

P(gun)}

(g)(chng)ϲL(zhng)һһӿ졣27^ţ6԰Ѳݳ;23^ţ9Ҳ԰Ѳݳ(wn)21^Ѳݳ?

ÿţÿijԲO(sh)1t27^ţ6ijԲ27X6=16223^ţ9ijԲ23X9=207;

ĜpȥСģ207-162=45;ߌ(du)(yng)씵(sh)IJֵ9-6=3()tݵL(zhng)45/3=15(ţ/);

ԭеIJ˷——

ʽA^BijԲpȥBԲݵL(zhng)ʡ

ԭеIJ=27X6-6X15=72(ţ/)

δ֪Բţ֞ɂ(g)֣

һСȳ²(g)(sh)Dzݵıʣ@f(shu)Ҫ21^ţ֞ɲһ15^ţIJ;ʣµ21-15=6ȥԭеIJݣ

씵(sh)飺ԭеIJ/ʣµţ=72/6=12()


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