2024 Tus sau: Malcolm Clapton | [email protected]. Kawg hloov kho: 2023-12-17 03:58
Tus kws qhia ntawv thiab cov tub ntxhais kawm xav tsis thoob yuav daws qhov teeb meem no li cas nrog kev pab ntawm lej lej. Xav tau koj kev pab!
Anton Pavlovich Chekhov muaj ib zaj dab neeg "Tus Kws Qhia". Nws tus phab ej, cov tub ntxhais kawm theem siab Yegor Ziberov, qhia ib tug tub hluas muaj kaum ob xyoos Petya Udodov hauv ntau yam kev kawm. Muaj ib hnub Yegor nug nws tus tub kawm txog qhov teeb meem hauv qab no: "Tus tub lag luam yuav 138 yards ntawm daim ntaub dub thiab xiav rau 540 rubles. Cov lus nug yog, muaj pes tsawg arshins nws puas tau yuav rau ob qho tib si, yog tias xiav nqi 5 rubles ib arshin, thiab dub 3 rubles?"
Petya tsis paub dab tsi txog cov kab ke sib npaug tsis tau, yog li nws tuaj yeem nrhiav tau cov lus teb tsuas yog nrog kev pab ntawm lej lej. Sim thiab koj daws qhov teeb meem ntawm txoj kev no.
Piv txwv tias tus tub lag luam yuav tag nrho 138 yards ntawm daim ntaub rau 5 rubles: 138 × 5 = 690 rubles. Tab sis qhov tseeb, nws siv tsuas yog 540 rubles. Cia peb xam qhov txawv nrog tus nqi tiag: 690 - 540 = 150 rubles. Tus tub lag luam muaj peev xwm txuag tau nyiaj no los ntawm kev yuav cov ntaub pheej yig dua. Ntawm ib lub yardstick, nws txuag 5 - 3 = 2 rubles.
Yog li ntawd, koj tuaj yeem suav cov nyiaj tau los ntawm daim ntaub dub raws li hauv qab no: 150 ÷ 2 = 75 yards. Qhov no txhais tau hais tias tus nqi ntawm daim ntaub xiav yog raws li nram no: 138 - 75 = 63 yards.
Rau kev ntseeg tau, peb yuav tshawb xyuas cov txiaj ntsig tau los ntawm kev siv lub tshuab sib npaug.
Cia x yog tus naj npawb ntawm arshins ntawm daim ntaub dub, thiab y - tus naj npawb ntawm arshins ntawm daim ntaub xiav. Tom qab ntawd peb tau txais cov kev sib npaug hauv qab no:
x + y = 138;
3x + 5y = 540.
Cia peb qhia x ntawm y: x = 138 - y. Cia peb hloov cov x tau rau hauv qhov sib npaug thib ob: 3 × (138 - y) + 5y = 540. Cia peb qhib cov brackets: 414 - 3y + 5y = 540.2y = 126, y = 63. Yog li, cov tub lag luam yuav 63 yards ntawm daim ntaub xiav thiab 138 - 63 = 75 yards dub. Nws tag nrho haum!
Qhia teb Nthuav teb
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