Tap chi Khoa bpc BHQGHN Nghien cihi Giao due Tap 30, S6 212014) 19 27 Nghien curu cac tinh hudng day hpc Toan trong moi tnrong may tinh bo tui nha mot phan mem gia lap Le Thai Bao Thien Trung Khoa Tod[.]
Tap chi Khoa bpc BHQGHN: Nghien cihi Giao due Tap 30, S6 212014) 19-27 Nghien curu cac tinh hudng day hpc Toan moi tnrong may tinh bo tui nha mot phan mem gia lap Le Thai Bao Thien Trung Khoa Todn-Tin, Trudng Dgi hoc Suphgm TP Hd Chi Minh, 280 An Dirong Vuong, qugn TP Hd Chi Minh Viet Nam Nhan 20 thang nam 2014 Chinh sira 18 thang nam 2014; chap nhan dang 25 thang n5m 2014 Tom t3t: Trong chircmg trinh va cac sach giao khoa thong Viet Nam hien hanh, xu huong sir dung may tinh bo tui (MTBT) de trg giup tinh loan va to chiic cac hoeit d^ng giang day Toan cang dugc khuyen khich Van de ihiet ke cac tinh huong day hoc Toan co sif dung MTBT va thuc nghiem danh gia cac hoat dong nhim hoan thien chiing truac ap dung vao thuc te giang day doi hoi phai co nhung nghien cihi nghiem tiic ca ve phuong dien ly luan lin thirc nghiem Tuy nhien, cac nha nghien cihi phircmg phap giang day Toan thieu mot phuang tien de thu diap thong tin trien khai cac tinh huong day hoc voi MTBT Trong bao cao nay, chiing t6i se gidi thieu mpt phan mim gia lap (PMGL) co giao dien cua loai MTBT dang dugc su dung bien a nha trucmg thong hien de thu thap thong tin ve cac thao tac bam may ciia hgc sinh {theo mo hinh may tinh Alpro cua Nguyen Chi Thanh 2005, [7]) Chung toi ciing sg giai thieu va phan lich mot tinh huong day hoc co sit dung MTBT Kiln thiic nhim d6n tinli huong la chinh xac ciia kit qua mot nhiem vu tinh gan diing Tir khda: Day hpc Toan, may tinh bo tin, phan mem gia lap, tinh gan dung L i d o xay d y n g m o t p h a n m e m gia lap Trong cdc sach giao khoa (SGK) pb6 thong Viet Nam hiSn hanh, viec sii dung M T B T de thuc hien cac tinh toan va to chuc cac hoat-dgng day hgc da dugc minh hga mgt each cbinh t h u c ' Su xuat hien manh me ciia M T B T dat vin de nghien curu anh huong ciia chiing va each thirc tich hgp chiing day hgc Toan Chiing ta hay xem xet mgt kieu sai lam quen thugc dugc tim thay bai lam cua n h i l u hgc sinh lien quan den bai loan khao sat ham so va ve thi a cac ki thi tot nghiep trung hgc ph6 thong (THPT) va tuyen sinh cao d i n g , dpi hgc Chang han, vdi yeu cau khao sat va vS thi ciia ham so = / M = -x'-5x'+llx+l f(x) = 2x^-10x+12 = ' » x = 3hayx = Bang bien thien: X f(x) DT 84-909657826 Email: letbttrung@gmail com ' Vol lo^i mSy CASIO FX-220MS (cho b?ic hpc THCS) v CASIO FX-500MS (cho b^: hpc THPT) Sx) -oo + 0 ~ +i» • ^ — - ^ L TB T- Trung Tgp ehi Khoa hpc DHQGHN: Nghien ein< Gido d{ic, Tgp 30 S6 (2014) 19-27 Su nhim lln thii to ^ua bai nghiem ciia dgo ham tren bang biln thien xu5t hien kha bien cac bai Iam ciia hgc sinh^ Vay, dau la nguon goc ciia sai ISm ti-en? tinh huong day hgc cu the moi trudng MTBT nho chiic nang luu lai cac phim ma hgc sinh da thao tac BAD cAo Mgt yeu to tra Iai cho cau hoi thii nhiit co thi dugc tim thdy chiing ta thuc hien lai viec tim nghiem ciia dao ham bang chirc nang giai phuang trinh bac hai mgt an cua may CASIO FX 570MS (loai may tinh ph6 biln hien nha truong Viet Nam) Nbu vay thii tu xuat hien cac nghiem cua MTBT giai thich cho sai lam ve m|t thijf tu ciia cbiing tren true so ciia bang bien thien Nha nghiSn ciiai se de phat hien nguyen nhan sai ISm ban hp co m6t cong cu de xem lai diln bien thyc td ciia hgc sinh su dung MTBT Trong boi canh dat ra, chiing toi nhan thay sg can thiet phai xay dung mgt PMGL co giao dien va hanh vi so gidng vdi cSc loai MTBT dugc su dyng bien truang pbo thong Vi|t Nam hi?n nay"\ PMGL la mgt cong cu cho ph6p tiep c|n "/i(5p den"* - nguoi bgc - a cac " Sai lam iren xuSt hien ca hoc sinh tinhfl;3)va f(2) bang bien thifin Viec ve dung d6 thj (voi bang bien thien sai) tradng h^p cho thay duong nhu hgc sinh dl thupc cac d^ng ihj iing vcri cac dang ham sd quen thugc day hoc giai tich ' Chung toi da chgn giao dien va hanh i i s6 ciia MTBT CASIO FX570 MS Ak xay dung P.MGL Wang ung - loai may dang dugc hgc sinh tnmg hpc su dyng bien hifn naj', * "Cho den giiia the ki XX nguoi ta vin tin ring, niu kliong CO each gl hieu sau duoc tam linh nguoi thi cfing CO nhu:ng quy luat chung chi phoi each img xir ciia timg ci the I-l Tic nhan kich thieh S > Phan \^ dap lai R > Chii th^ (Hgp den) PMGL CO chuc nang lim lai cac phim da thao tac va cac ket qua tinh toan tuong iing ma nguai hgc da thuc hien tren giao di?n MTBT CLia PMGL Nghta la, neu chi quan sat san pbSm viet ciia hgc sinh nhieu hoat dgng day hpc vdi MTBT, cbiing ta sg khong biet ro dieu gi dan den cau tra Iai ciia hg ciing nhu dieu ^ khien hg khong tra Iai Chiing toi se Iam ro hem nhung lgi icb ke tren pbSn tilp theo ciia bai bdo Chiing toi da van dung PMGL dl nghiSn cim bai tinh bufing day bgc Toan lien quan den cac chti de: so gan diing va lap trinh tinh toan Trong khuon kho ciia bai bao nay, chiing toi chgn gidi thieu truong bgp d^iy hgc tinh toan gan diing Nghien ciiii mgt boat dgng d^y hgc vo'l phan mem gia l^p: t r u ^ g bgp s6 gan diing Trong hau hit cac nganh nghe dugc dao tao a bac cao dkng - dai hgc, nguoi hgc it nhieu deu phai thuc hien cac tinh toan gSn diing Nhung chi mgt so it sd cac nganh hgc a bac nghifin ciiu sau vl s6 gin diing Vi vay, ngu6i hgc chi dua chii yeu vao c^c kiln thiic da tiep thu b$c ph6 thong thuc hi^n cac phep Trong quan diem nay, chu the duoc coi nhu mgt hpp den Nguoi ta kh6ng tinh gi dSn ljch su, kien thuc, quy trinh tu cua chii the" ([1], trang 39) L T B T Trung / Tt^ chi Khoa hoc DHQGHN • Nghieiu Gido due Tap 30 So (2014) 19-27 tinh gan diing Sinh vien thuang dat cau hoi; chiing ta phai ldy bao nhieu chu so thap phSn? Cau hdi chac chan se lam nhieu giang vien Iiing tiing va kho dua cau tra Iai hgp li va nhu vay cac cau hoi Toan hgc sau day co the dugc dat ra: - Tai phai lam tron ket qua gan diing tir MTBT? - Lam xac dinh chinh xac ciia mgt ket qua gdn diing nay? Lam cai thien no? 2.7 Mdt sdyiutd Todn hgc vi ddi tuong sd gdn dung Trong khuon kho ciia bai bao, chiing toi chi tong hgp Iai mgt s6 khia canh cdn thiet vl ddi tugng sd ^ n diing nham giai Hiich va danh gia thuc trai^ day hgc d6i tugng a truong ph6 diong (Thiing toi ciing gioi han nghien ciiu cua minh tren s6 ^ diing tiiap phan, dugc sir dung gan nhu nhdt cac tinh toan thong thuong Khi udc luong mgt so thuc bang mgt so gan diing ma khong danh gia dugc chinh xac thi so gan diing dy khong co gia tri su dung, Noi each khac mgi so deu la so g ^ diing ciia va van de la so nao gan voi so can tim hon D8 danh gia mgt so gan diing, ta thuang dinh nghTa khai niem sai sd tuyit ddi: "Neu a* Id gid tri dung cua mgt dgi lugng vd a la gid tri gdn diing ciia a* thi sai sd tuyet ddi cua gid tri gdn diing a Id dai lugng Aa cho |a*-aj thi them vdo chir sd giir lai cudi cimg mdi don vi, cdn niu cha sd bddi ddu tien