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        rg2022-09-22 17:15:43 С ҪͶ
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        г̆}СԇСWĴِĴ}֮һ(Ӌ㡢Փ׺г)w}׃ӣγ10N}ͣиصĽ}

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        СWؿ} ƪ1

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        һ˻߶˕r(ͬrr)(ͬ)(ͬ)ĕrg;xȗlϳFг̆}ڱِдFsռ80%ҡh쾚ؘʽⷨs=vtYϘ˜ʾήD()ֻõ׷ĻʽɽQڽ}ĕrһF^r׃rYԼĈDֶȥr

        s׷}

        (1)׷}һ׷}һ\ӌһ҂׷}}˼·ȫһֻscPIǘ˜ʮDܷߵ\ӠB

        (2)׷}ɂһ·ͬrͬػͬrط׷׷Qv͆}֞˜(֪ɵؾx̓ٶn׷cضcľxҎrgȵ׷Δ)ͼچ}(Ҋ֪ٶһں߶صʼcr׷ĴΔ)

        ˜ͽ̶ⷨ܏·֣ܷһ_ʼλ׷rgķxʹΔ׵ö۾ʾDֻܴЂJRowóǷǿԇrgм˜ʳߴD

        һõĕrgʽ(ֻeҏăɶͬrlrͬһ˳lrҊԲ٘)

        γrgtγ=s/(v+v)

        γ׷rgtγ׷=s/(v-v)

        nrgtn= tγ(2n-1)

        m׷rgtm= tγ׷(2m-1)

        ޶rgȵΔNΔ=[ (tn+ tγ)/2 tγ]

        ޶rgȵ׷ΔM׷Δ=[ (tm+ tγ׷)/2 tγ׷]

        ע[]ȡ̖

        ֮xȡ׻ҁоP·̵Pϵ漰چ}ҪעҪ\ӷe

        }ס҃܇ͬrAسl300ǧ׵ABɵ֮g֪܇ٶÿСr30ǧ܇ٶÿСr20ǧ 

        (1)ڶӭֽ^Lrgס׷?(2)rxcǧ?(3)50Сrȣ҃܇ӭٴ?

        ܇}

        co漰܇LС}ͷ֞飺

        1܇^()һLٶһL]ٶȣ

        ⷨ܇܇L+()L(·) =܇ٶȡͨ^ĕrg;

        2܇+(늾U)һLٶȣһ]L]ٶ

        ⷨ܇܇L(·)=܇ٶȡͨ^rg;

        3܇+ˣһLٶһ]Lȡٶȣ

        (1)܇+ӭߵˣஔ}

        ⷨ܇܇L(·) =(܇ٶ+˵ٶ)ӭe^ĕrg;

        (2)܇+ͬߵˣஔ׷}

        ⷨ܇܇L(·) =(܇ٶ-˵ٶ) ׷ĕrg;

        (3)܇+ڻ܇ϵˣ܇c˵׷}

        ⷨ܇܇L(·) =(܇ٶȡ˵ٶ) ӭe^ĕrg(׷ĕrg);

        4܇+܇һLٶһҲLٶ

        (1)e܇}ஔ}

        ⷨ܇܇L+܇܇L(·) =(܇ٶ+܇ٶ) e܇rg;

        (2)܇}ஔ׷}

        ⷨ܇܇L+܇܇L(·) =(܇ٶ-܇ٶ) e܇rg;

        ڻ܇^܇܇׷Լ܇ͻ܇֮g׷ȵ@׷N͵}Ŀڷ}ĿĕrһýYDMС

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        ٶˮд}ҲͲyӛס1ʽ

        ˮ=oˮ+ˮٶȣͿ현ƌʽ

        ˮ=oˮ-ˮٶȣ

        oˮ=(ˮ+ˮ)2

        ˮٶ=(ˮ-ˮ )2

        ԽYՓ£

        (1)׷ˮٶȌ׷ĕrg]ӰoՓͬ߀ăɴٶȲɡ{đʹÞơ

        2)ˮƯٶ=ˮٶt1= t2(t1ﵽlFĕrgt2İlFʰĕrg)cˮПoP˽YՓĕrgʽdz׵ĽQˮ}䱾Ҳdzӛ

        }һlм҃ɂa^״a^Ҵa^50ǧ̎һҿʹһ؛քeļ҃ɴa^ͬrl񂣬ɴoˮٶͬ ʹlrһƷĴˮ10犺Ʒʹ5ǧʹ20ǧ׺^׷sƷ׷ϕrǡú؛ˮٶ

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        g@yC^̌ٽ}]Ўһ3ʽһ㆖}ӭж

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        }ABǹ܇ăɂ܇վAվBվ·ÿ8c11cABվÿ30ͬrlһv܇֪AվBվ γҪ105BվAվγҪ80犡830900Aվl܇˾CքeܿvBվ_܇?

        (2)ڰ܇“3ʽʹ

        ܇g=(܇ٶ+ٶ)¼rgg

        ܇g=(܇ٶ-ٶ)׷¼rgg

        ܇g=܇ٶȡ܇l܇rgg

        12ϲ

        ܇g=ٶȡrgg

        ֞2С}ͣ

        1һgl܇}3ʽѸ;

        2_Ŀĵغ׷Ĺ܇v˜ʷǣD-Mܶ3ʹʽ-Ysȫ=vt-Yֲ䆖}

        }СT܇ȥСҾە·ע⵽ÿ9犾һv܇ĺ󷽳ԽССT܇·܇ˣֻ܇ȥС@rС ְlF܇Ҳÿ9犳Խһv܇֪܇ٶСT܇ٶȵ5@3N܇v^жքô܇վÿٷ lһv܇?

        ƽٶȆ}

        ׵}ʽҪӛ·=ƽٶȡrgs=vtıҪֱӌʽⲢҎγг̆}ĽyһQ

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        犱톖}

        ǭhΆ}ضPϵʽv= 12vr

        (1)Yӛrÿ1/120.5;ÿ16rᘺͷᘡ롱칲غ11ֱ11Σֱǹ22(ʲôλҪԼñDY)

        (2)}˼··̲˼·

        ()=(r)+()

        x=x/12+(_ʼrrᘵ'+Kֹr^rᘵĸ)

        ǣ6x=x/2+(_ʼrrᘵĽǶ+Kֹr^rᘵĽǶ)

        ԽQ󲿷֕rᘆ}}غֱǡֱǶăɂgһrγɶٽǶȡ

        }9c23֕rrᘺͷᘵĊAǶٶ?@һr_ʼ^ٷrᘺͷᘵһδֱ?

        (3)犆}õĽQѽг̆}׃ɱ}ˣıʽ

        Ԅӷ݆}

        ȻûPϵʽsݼ=(vˡv)tϻ½Q@·̆λȫǡΨһҪעtϻҪʾɌHߵļ/˵ٶ

        }̈ԄӷԄ񂣬ɂķ߄ŮߣкYŮ40_к80_¡кλrgߵķݼŮ2tԓoֹrɿķݼжټ?

        ʮʮ·چ}

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        ʮһУ܇}

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        (1)܇ٲ׃-ٲ׃-2(Ҋ)

        (2)܇ٲ׃-ٲ׃-

        (3)܇ٲ׃-׃-2

        (4)܇׃-ٲ׃-2

        ˜ʽⷨD-3ʽӣ

        1rg=һ܇ĕrg+@鲽еĕrg;

        2܇ߵĿ·;

        3һ鲽еĕrg=܇ͬrl ĕrg

        õׂ·̶εıֵٸ

        }װcҰWͬrČWУlȥ15ǧĹ@ס҃ɰIJٶȶÿСr4ǧWУһv܇ٶÿСr48ǧ @v܇ǡһČWʹɰW̕rgȵ_@ôװWcҰWҪеľxǶǧ?

        ʮC

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        (1)(Cһߵh˶Ҫ؁)

        1ˣ;ʳT=2/3t;;ʳT=3/4t

        2ˣ

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        2;ʳT=(1+1/3+1/5+1/7++1/(2n-1))t

        СWؿ} ƪ2

        1Ͳ} ֪ɔĺc@ɂ

        ֪ɔ102@ɂ

        E

        ͼϲԽԽ;2Ǵ;

        ͜pȥԽpԽС;2С

        Et=(10+2)2=6С=(10-2)2=4

        2Ȇ}

        הҔ12Ҽ:=74ɔ

        E

        ҵı

        ӌHĸ

        һԸԵıɔ

        һ12(7-4)=4

        Լה飺4X7=28Ҕ飺4X4=16

        3g}

        E

        g׃ͬrӜp

        qһ׃Ҳ׃

        ץס@cһж

        1С܊8 qְֽ34qְֵgС܊3?

        q׃Ěqc34-8=26Ȼ׃֪DȆ}

        26(3-1)=13ְֵg13X3=39qС܊g13X1=13qԑԓ5

        213qܵܽ9q܂zqĺ40qr˸ԓǶٚq?

        q׃Ěq13-9=4Ҳ׃q40q4DͲ}

        tĚq(40+4)2=22ܵܵĚq(40-4)2=18Դ9

        4ͱȆ} ֪w󲿷

        ұ͞27::=2:3:4ұ

        E

        Ҫ˺ּԭt

        ĸȔԼ

        ͳԱԓõ

        ĸȔͣĸ飺2+3+4=9;

        Լtұռ͵ıքe293949;

        ͳԱtמ27X29=6Ҟ27X39=927X49=12

        5uͬ\}

        uͬ\^36 _120uÔ

        E

        OȫuOȫ

        ˎֻ_ˎֻ?

        _IJuÔ

        ÕrOȫutӔ=(120-36X2)(4-2)=24

        urOȫãtu =(4X36-120)(4-2)=12

        6 ·̆}

        (1)}

        ҃ˏ120ǧ׵ăɵ׵ٶȞ40ǧ/СrҵٶȞ20ǧ/Сrٕrg?

        E

        һ·ȫ^

        ٶȺͰѕrg

        һ·ȫ^^·̺ǡǃɵصľx120ǧס

        ٶȺͰѕrg҃˵ĿٶȞ˵ٶ֮40+20=60(ǧ/Сr)ĕrg͞12060=2(Сr)

        (2)׷}

        ܶˏļȥ㲽ٶȞ3ǧ/Сr2Сr󣬵ܵT܇lٶ6ǧ/Сrוr׷?

        E

        BҪwS׷

        ߵ·ٶȲrg

        ߵ·̣3X2=6(ǧ)

        ٶȵIJ6-3=3(ǧ/Сr)

        ׷ϵĕrg63=2(Сr)

        7 Ȇ}

        (1)ˮϡ

        20ǧ˝Ȟ15%ˮˮǧ˺׃10%?

        E

        ˮˮ

        ˮpˮǼˮ

        ˮǣԭǞ飺20X15%=3(ǧ)

        ˮ3ǧ10%‘жˮ310%=30(ǧ)

        ˮpˮˮpȥԭˮ30-20=10(ǧ)

        (2)ǝ⻯

        20ǧ˝Ȟ15%ˮǶǧ˺󣬝׃20%?

        E

        ˮˮˮ

        ˮpˮ}

        ˮԭˮ飺20X(1-15%)=17(ǧ)

        ˮˮ17ǧˮ20%‘жˮ17(1-20%)=21.25(ǧ)

        ˮpˮˮٜpȥԭˮ21.25-20=1.25(ǧ)

        8̆}

        һ헹׆Ϊ4ɣ҆Ϊ6ͬr2҆Ϊ?

        E

        ̿O11ԕrgǹЧ

        ΪrЧԼһRrЧDZ˵Чʺ

        1pȥѽıǛ]]'ԹЧʾǽY

        [1-(16+14)X2](16)=1()

        9ֲ䆖}

        E

        ֲٿҪ·?

        ֱĜpȥ1AǽY

        1һlL120׵R·ֲg4ֲٿ?

        ·ֱģtֲ1204-1=29()

        2һlL120׵ĈAλ߅ֲg4ףֲٿ?

        ·LjAtֲ1204=30()

        10ӯ̝}

        E

        ȫӯȫ̝ĜpȥС;һӯһ̝ӯ̝һ

        ԷIJYǷĖ|

        1Сѷÿ109;ÿ87жСѶ?

        һӯһ̝tʽ飺(9+7)(10-8)=8()Ӟ8X10-9=71()

        2ʿӏÿ45lt680l;ÿ50lt200lʿӏ?

        ȫӯ}tĜpȥСʽ飺(680-200)(50-45)=96()ӏ96X50+200=5000(l)

        3Wlÿ10t90;ÿ8 t8ٌWٕ?

        ȫ̝}tĜpȥСʽ飺(90-8)(10-8)=41()41X10-90=320()

        11}

        r犬Fڱʾĕrg18cD1990Ȧǎc?

        E

        (N-1)С1(N-1)

        ׃rҪֻ̣Ҫ

        DһȦ1СrD24ȦǕrD1ȦҲǕrᘻصԭλ19802422ஔڷǰD22ȦǰD22Ȧஔڕrǰ22Сrrǰ22СrҲஔ24-22=2Сrஔڕr2Сrrஔ18-2=16(c)

        12ţԲ݆}

        E

        ÿţÿijԲOǷݔ1A^BijԲǎ?M^NijԲǎ?ĜpȥСԶߌ씵IJֵYDzݵLԭеIJ˷

        ʽA^BijԲpȥBԲݵLʡδ֪Բţ֞ɂ֣һСȳ²Dzݵı;еIJʣţ͌Ҫ씵֪

        ϲLһһӿ27^ţ6԰Ѳݳ;23^ţ9Ҳ԰Ѳݳ21^Ѳݳꡣ

        ÿţÿijԲO1t27^ţ6ijԲ27X6=16223^ţ9ijԲ23X9=207;

        ĜpȥС207-162=45;ߌ씵IJֵ9-6=3()tݵL453=15(ţ/);

        ԭеIJ˷ơ

        ʽA^BijԲpȥBԲݵLʡ

        ԭеIJ=27X6-6X15=72(ţ/)

        δ֪Բţ֞ɂ֣

        һСȳ²Dzݵı@fҪ21^ţ֞ɲһ15^ţIJ;ʣµ21-15=6ȥԭеIJݣ씵飺

        ԭеIJ·ʣµţ=726=12()

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