IĴ NG DUNG PHlTdNG PHAP GIA THIET TAM TRONG DAY HOC TOAN OTIEU HOC ThS, NGUYEN TRUONG SINH LE THI H A N H " deap tieu hoc, hoat dpng giai toan eo vai tro rat Iquan trpng trong viec giOp hpe sinh (HS)[.]
IJ^NG DUNG PHlTdNG PHAP GIA THIET TAM TRONG DAY HOC TOAN OTIEU HOC ThS, N G U Y E N T R U O N G SINH - LE THI H A N H " d eap tieu hoc, hoat dpng giai toan eo vai tro rat Iquan trpng viec giOp hpe sinh (HS) tong hcfp va van dung eac iden thifc da hpc vao cae bai toan (BT) cu the; dong thoi, eon ren luyen tu sang tao cho eae em Viec ren luyen kT nang giai toan eho HS la rat quan trpng, giup eae em bietvan dung cac k i ^ thtJe da hpc de giai quyet van de theo yeu eau cua BT Phuong phap gia thiet tam la mpttrong nhung phuong phap dugc siidung nhieu giai toan dtieu hpe, nhait lagiaieae BT rang eao Phan tich:Cac dai lupng eocung tinh chat la ehi so ehan cua loai vat, khac ve so lupng BT la so chan gavasoehan eho; bdivi gaehlc62 ehan, cho eo Chan Do ta eo thetien hanh giai BT theo cae eachsau: Cac/7/.Gia sti36 toan la ga, nhuvay so ehan sela:36x2 = 72(chan);s6chanbithieu la: 100-72 = 28 (ehan).Sod? so ehan bj thieu nhuvay la m6i chokhong dupc tinh du 4ehan, mabj tinh bdtdila:4-2 = (ehan) Vay, soeon cho sela: : = 14 (con) Socon ga la: 36 -14 = 22 (con) nhieu BT, gia thiet da eho eo nhung dai lupng giong £3apso;Ga22eon,ch614con veban chat nhung khae vesoli/ong, dan t6i Tuong tu, tacd the giai theo each: "G la su 36 eon sukhacnhau eua ketqua Oe giai loai toan nay,ta gia toan la eho thi " su'eae dai lupng eoeung so li/cmg, ttjrdo setao sti Ca'c/?£'Giasul 00 ehan deu lachan ehd, nhuvay chenh lech giiia dteu gia suva gia thiet eua BT Dt/a so eon ehd se la: 0 : = 25 (con); td'ng so con vao suchenh lech ngucfi hpe tim dupe gia tn eua dai thieula:36-25=11(con) lupng tht) hai Phuong phap giai toan nhuvay gpi la C t i b d l chd ra, thay vao conga thi sd'chan phuongphapgiathiettam _ khdng da va so eon setang len Nhuvay, mudn LPhuongphE^gia thiet tam 1)Khsn'tan vephuangph^gathl^tam.Jtong 2) Cac budc giaitoin bing phuang ph^giathi^ tang len duge 11 eon nOa thi phaibd 11 eon chdva tem.'Degiaieac BT b ^ g phuong phap nay, theo ehung ttiay vao 22 ga Khidd, sochd la: 25 -11 = 14 (eon) toi, ngucri hpe cothe giai theo eae bu6e sau: Buq'c 1: £)apsd;Ga22con,ehd14eon Tom t^t de; Bude2:Tm eae dai lupng eoeCing mpt Tuong tu,ta cdthe giai Uieo caeh:"Giasu'100 chan tinh ehatnaodonhung khac ve so lupng; 5£/oc 3; deu la chan ga thi " G ia su dai lupng vt/a tim obuoc co eung so luong, NhinxetV'fdul cdthe giai bang nhieu each, eac suy suchenh lech vcfl gia thiet eua BT, tCrdotim dupe each giaideung^n gpn vade hieu.Day laBTmaphucffig gia tiimpt dai luprng phap gia thiet tam the hien dugc su dge dao BT Phuang phap gia thiet tam giai toan d ngoai phuong phap gia thiet tam, khdtim duge ldi giai b^ng phuong phap khac (hoae phuang phap khac se tieu hoc Nhin ehung.nhiJng BT giai ducfc b^ng phuong phtic tap hon) phap gia thiet tam cung co the giai b^ng phuong phap khae.Tuynhlen.trong nhieu trucfng hpp, each giai b i n g p h u o n g p h a p g i a t h i e t t a m thudng gpn gang d l hieu, mang tinh ehat doe dao Ta xet eae vi dg sau day: l^/du/.'Vuagavuaeho.bolaichotron.ba muoi sau con, mpt tram chan ehan,tinh soga vacho Hoi CO bao nhieu eon ga, bao nhieu eon eho? 56 Top chi Gido dye so 306 Vidij2:Uo\ ngudidudinh di tLf A den B vdlvan toe khdngdo'itrongmgtthdiglandtidinh Ngudi ddnham tinhrlngneudittiAdenBvdiv$nt6c35km/hthiseden sdm hon so vdi thdigian dudjnh la gid, neu divdivSn toe 25 km/h th! se mudn hon so vdi thdi gian dudjnh gid Tinh quang dudng AB va thdi gian diidinh 'TnMigfiaibQcRoigBfc -(ki2-3/2023) Phan ftc/j;Trong bai toan ta thay hai dai tucfng la:vantcK:35l(m/hvavantoc25l(m/h Cac/}/(phi/cfngphapgiathi^tani}:Giasij'l