- P(gun)]
2016СW(xu)}c}˼·
ˎW(xu)Мʂ2016СԇYJBYSСP(gun)СW(xu)}c}˼·gӭϣW(xu)俼!˽P(gun)ϢՈmP(gun)ע҂îI(y)ӖW(wng)!
1.ӯ̝(wn)}
һČijN˜ʷֽMa(chn)һNYһN˜ʷֽM֮a(chn)һNYڷֽMĘ˜ʲͬɽYIJP(gun)ϵֽMĽMĿ
˼·ȌɷN䷽M(jn)б^ژ˜ʵIJɽY׃@(g)P(gun)ϵӷĿݔȻ}Ŀ
}ͣ
һһβ;
ʽݔ=(+㔵)÷ɴÿݔIJ
ڮɴζ;
ʽݔ=(^һ^С)÷ɴÿݔIJ
ۮɴζ;
ʽݔ=(^㔵һ^С㔵)÷ɴÿݔIJ
c(din)ͿĽMDz׃
P(gun)I(wn)}_ͿĽM
2.̆(wn)}
ʽ
ٹ=Ч×r(sh)g
ڹЧ=÷r(sh)g
۹r(sh)g=÷Ч
˼·
ټO“1”(Ϳo(w)P(gun));
ڼOһ(g)Ĕ鹤(һɹÕr(sh)gС)(g)P(gun)ϵԺ(jin)εرʾЧʼr(sh)g
P(gun)I(wn)}_r(sh)gЧgăɃɌP(gun)ϵ
3.e
˼·
һЩeӋֱ\ùʽrһҪDM(jn)иaƽDֽ׃دBʹҎtĈD׃?yu)ҎtĈDM(jn)Ӌ;ҪպӛһЩҎeҎ
÷
1.Bo(xin)
2.õȵȸߵăɂ(g)e
3.đO(Щc(din)O}Ŀf(shu)c(din)}r(sh)ɰc(din)Oλ)
4.Ҏ
ٵֱ֪һl߅e(б߅ƽ4ڵֱεe)
ΌǾ(xin)B(xin)e
ۈAeռe78.5%
4.Cг
г̆(wn)}оw\(dng)оwٶr(sh)g·֮gP(gun)ϵ
ʽ·=ٶ×r(sh)g;·÷r(sh)g=ٶ;·÷ٶ=r(sh)g
P(gun)I(wn)}_\(dng)^(gu)еλúͷ
(wn)}ٶȺ×r(sh)g=·(Ո(xi)ʽ)
(wn)}r(sh)g=·̲÷ٶȲ((xi)ʽ)
ˮ(wn)}ˮг=(+ˮ)×ˮr(sh)g
ˮг=(-ˮ)×ˮr(sh)g
ˮٶ=+ˮ
ˮٶ=-ˮ
oˮٶ=(ˮٶ+ˮٶ)÷2
ˮ =(ˮٶ-ˮٶ)÷2
ˮ(wn)}P(gun)IǴ_w\(dng)ٶϹʽ
^(gu)(wn)}P(gun)IǴ_w\(dng)·Ϲʽ
Ҫ(hu)(xin)ΈD
}֪ͣ·(··)r(sh)g(r(sh)gr(sh)g)ٶ(ٶȺٶȲ)ɂ(g)(g)
5.uͬ\(wn)}
uͬ\(wn)}ַQ(chng)ÓQ(wn)}O(wn)}ǰѼOeDzÓQ(li);
˼·
ټOOijNF(һӻҺͼһ)
ڼOl(f)˺}ĿlͬIJҳ@(g)Ƕ;
ÿ(g)ɵIJǹ̶ĶҳF@(g)ԭ;
ٸ@ɂ(g)m{ȥFIJ
ʽ
ٰuOӣu=(_×^——_)÷(_——u_)
ڰӼOuÔ=(_һu_×^)÷(_һu_)
P(gun)I(wn)}ҳIJcλIJ
г̆(wn)}
г̆(wn)}СW(xu)W׃һ(g)(zhun)}ՓڊWِ߀“С”W(xu)ԇзdzҪĵλг̆(wn)}а܇(ch)^(gu)ˮд;܇(ch)Ch(hun)гг̵ȵÿһ(li)(wn)}Լc(din)QҲͬг̆(wn)}o(w)Փô׃x_(ki)“(g)(g)P(gun)ϵ”
@(g)ǣ ·(s)ٶ(v)r(sh)g(t)
1.(jin)г̣ · = ٶ × r(sh)g
2.(wn)} ·̺ = ٶȺ × r(sh)g
3.(wn)} ·̲ = ٶȲ × r(sh)g
˼·
ټO“1”(Ϳo(w)P(gun));
ڼOһ(g)Ĕ鹤(һɹÕr(sh)gС)(g)P(gun)ϵԺ(jin)εرʾЧʼr(sh)g.
P(gun)I(wn)}_r(sh)gЧgăɃɌP(gun)ϵ
(jng)(jin)uϾñط־ñغ
ΰס@(g)Լ֮gNP(gun)ϵ͕(hu )l(f)FQг̆(wn)}߀кܶѭ
“г̆(wn)}”(sh)HҊ(jin)“г”
1мͬr(sh)ͬسl(f)@һ(g)ͬcÿ40ÿ38ÿ36;3犺ͱ(wn)@(g)ԵL(chng)Ƕ?
@(g)г̵Ć(wn)}Ƀɂ(g)һ(g)M}Ŀoėlֻ(g)˵ٶԼһ(g)“3”ĕr(sh)g
һ(g)3犵ĕr(sh)g·̺͞(40+36)×3=228()
һ(g)@228_(ki)ʼĕr(sh)g˵ٶȲɵ^(gu)ĕr(sh)g228÷(38-36)=114()
ڶ(g)114Ҷһȫ
ԻL(chng)(40+38)×114=8892()
҂@һ(g)г̆(wn)}ֽ(g)(jin)εĆ(wn)}ʹ}˼·
֮г̆(wn)}c(din)Ҳyc(din)ֻҪ“(g)”֮g“(g)P(gun)ϵ”Qг̆(wn)}y!
̆(wn)}
̆(wn)}ҪоЧʺr(sh)g֮gP(gun)ϵ@(li)(wn)}֪loľwֻ“һ헹”“һK”“һlˮ”“һ”ڽ}r(sh)Æλ“1”ʾ
̆(wn)}P(gun)Iǰѹ“1”@Чʾǹr(sh)gĵ(ʾλr(sh)gɹĎ֮)M(jn)ͿԸЧr(sh)g֮gP(gun)ϵгʽ
Ч×r(sh)g=
÷r(sh)g=Ч
÷Ч=r(sh)g
1)һת6Сr(sh)Ҫ8Сr(sh)ɡFڃ˺΄(w)r(sh)ױҶ24(g)@жق(g)?
}˼·
O1tÿСr(sh)1/6ÿСr(sh)1/8ױÿСr(sh)(1/6-1/8)˺r(sh)ÿСr(sh)(1/6+1/8)˺Ҫ[1÷(1/6+1/8)]Сr(sh)@(g)r(sh)gױҶ24(g)
(1)ÿСr(sh)ױҶ?
24÷[1÷(1/6+1/8)]=7((g))
(2)@жق(g)?
7÷(1/6-1/8)=168((g))
@}߀һNӋ㣺
˺΄(w)r(sh)ҵĹ֮Ȟ顡1/61/8=43
ɴ˿֪ױҶɿġ4-3/4+3=1/7
@С24÷1/7=168((g))
2)һ(g)ˮײbһ(g)_(ki)ˮϲbɂ(g)ͬӴּM(jn)ˮ_(ki)4(g)M(jn)ˮܕr(sh)Ҫ5Сr(sh)עM(mn)ˮ;_(ki)2(g)M(jn)ˮܕr(sh)Ҫ15Сr(sh)עM(mn)ˮ;FҪ2Сr(sh)ˮעM(mn)Ҫ_(ki)ق(g)M(jn)ˮ?
}˼·
ע()ˮ(wn)}һ(li)Ĺ̆(wn)}ˮעˮˮˮஔһ헹ˮǹλr(sh)gˮǹЧ
Ҫ2Сr(sh)ȌˮעM(mn)Ҫʹ2Сr(sh)ȵM(jn)ˮcˮ֮һˮҪ֪M(jn)ˮˮܵĹЧʼ(һˮ)ֻҪOijһ(g)λ1ɂ(g)ɗlƳ
҂Oÿ(g)ͬӵM(jn)ˮÿСr(sh)עˮ1t4(g)M(jn)ˮ5Сr(sh)עˮ(1×4×5)2(g)M(jn)ˮ15Сr(sh)עˮ(1×2×15)Ķ֪
ÿСr(sh)ˮ顡(1×2×15-1×4×5)÷(15-5)=1
һ(g)ˮcÿ(g)M(jn)ˮܵĹЧͬɴ˿֪һˮĿ顡1×4×5-1×5=152Сr(sh)ÿ(g)M(jn)ˮܵעˮ顡1×22Сr(sh)עM(mn)һˮ
Ҫق(g)M(jn)ˮ?(15+1×2)÷(1×2)=8.5≈9((g))
De
СДW(xu)DeҪ֞ɴ(li)
һҎtDeƽDκwD;
ҎtDe(yc(din));
ΣS=ah÷2 ;ƽ߅:S=ah
ΣS=a2 ;L(chng)ΣS=ab
:S=(a+b)h÷2 ;AΣS=πr2
ϵĹʽڌ(sh)H\Õr(sh)҂Ҫ˼
κƽ߅εȵȸôeʲôP(gun)ϵ?
Sƽ߅= 2S
κƽ߅εĵeĸʲôP(gun)ϵ?
h=2hƽ߅
wDe
wS=6a2;L(chng)w:S=2(ab+bc+ac)
A:S=2πr2+πdh
һ(g)ɗlc߅ƽеľ(xin)Όεăɗl߅ȷֳ(Ҋ(jin)D)DӰֵeռ(g)DeĎ֮
@(g)αֳ(g)ͬIJҲ֪ҲֱӿYӲӰռ(g)DεĎ֮?
MψDλҎtDӋeҪ׃(dng)DελûDM(jn)ƴaʹ׃ɿӋeҎtD
ҿYһW(xu)DeĿc(din)W(xu)
1.ҎtDe(ƽDwD)ӛסʽ
2.ҎtDεĕr(sh)\ƴaҎtDDQҎtD
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