I lT, TT{PT chuy€n lf Quy DO n; Kh6nh Hitaz Nguydn
Giang Chdu, 11A9, THPT Tx Bio LQc,
LamDdng'
H.ANGNGUYEN
OON XUiN
GIAI ''PHUONG TRiNH CH[I''
Ban hdy thay cdc cht c6i gi6ng nhau b&i c6c
cht sd gidng nhau, c6c chfl c6i kh6c nhau
boi c6c cht s6 kh6c nhau, dd dugc cr{c ding
thrlc dring :
a) TOAN - HOC =2002 - TUOI + TRE b) TET - NHAM + NGO + 2002 - TOAN +
HOC+TRE= -x
bidt "r lA mot sd chSn tr6m nio d6.
Mdi cr{c ban hdy tham gia gd r6i hai "phuong
trinh ch[" niy dd d6n mtrng xuAn m6i nh6 ! NGUYENTHIANH (Ddn ph6'10, PhilThily, PhanThi4l, Btnh Thudn) i#,{rr*1;a?.4'' t,. cing c6 G-K, I-H.
llinh b€n bi6u thi c6c dudng bay phAi tim. Ndu
thay ddi t€n c6c tfrann pnO 5 ni,it 'Ucn ta c6 c6c hQ th6ng dudng bay kh6c.
JACOB STE INER... (ridp n"ang23)
C[ng c6 hic Steiner nhin to6n hoc theo kidu trd choi, chdng han nhu & bdi torln sau d6y.
Ngudi ta rim c'dc'h ndi liin n thdnh phd bdng nhrtng dttdng di thdng vd hai thdnh ph6'bdt ki phdi duoc nbi voi nhau. Mang dudng bd duo.c
tao thdnh nhu vdy phdi ngdn nhdt.
Ndu ci{c thinh phd li cr{c dinh ctra m6t tam
gi6c ddu hoic crii m6t hinh vu6ng thi theo f ban, mang nlo li tdt nhdt ?
Bdi todn md Steiner : li bli to6n n6i vd mOt cAu h6i mi cAu tri lli cdn phii khdm phd ra.
Ndu lbi ph6t bidu bao gdm c^au trA ldi thi d6 le dinh li. Ndu ngudi ta dd cho ban tu&ng tuong ra cAu trA ldi thi d6 le bbi to6n m&. Day le dang
to6n mb c6c nhi hinh hoc Hy Lap rdt ua thich-.
Clrint, 6 truhng Pestalozzi, Sieinei d6 llm quen
v6i phuctng phdp lu6n niy. Sau day ln m6t vidu.
Cho hai dudng trdn ddu ti6n ddng tAm. Dung
n duong trdn tidp xric v6i hai dudng trdn tr6n vh
d6i m6t tiep xric v6i nhau. Ddy n dutrng trdn
nqy c6 thd tu d6ng kin kh6ng, trlc li dudng trbn ddu ti6n c6 tidp -xric v6i duong trdn cu6i cing kh6ng ? CAu fri ldi lh : c6 ihd duo. c, nhun!