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PROBLEM SOLVING
O
L
E
H
YUDITHSIANE MELITA TAE
131 12 061
OSN 2002 NOMOR 3
TENTUKAN SEMUA SOLUSI DARI SISTEM
PERSAMAAN
X + Y+ Z = 6
X族 + Y族 + Z族 = 12
X続 + Y続 + Z続 = 24
PENYELESAIAN
X + Y+ Z = 6 ..........(1)
X族 + Y族 + Z族 = 12....(2)
X続 + Y続 + Z続 = 24....(3)
 KUADARATKAN PERSAMAAN (1)
(X + Y+ Z)族 = 6族
X族 + Y族 + Z族 + 2(XY +XZ +YZ) = 36
XY +XZ +YZ = 12...........(4)
 KALIKAN PERSAMAAN (1) DAN (2)
(X + Y+ Z)(X族 + Y族 + Z族) = (6 .12)
X続+Y続+Z続+XY族+XZ族+X族Y+X族Z+YZ族+Y族Z=72
XY族+XZ族+X族Y+X族Z+YZ族+Y族Z=48.........(5)
 KALIKAN PERSAMAAN (1) DAN (4)
(X + Y+ Z)(XY +XZ +YZ) =(6.12)
XY族+XZ族+X族Y+X族Z+YZ族+Y族Z+3XYZ=72
48 +3XYZ =72
XYZ = 8......(6)
RUMUS POLINOM BERDERAJAT 3
an(x-x1)(x-x2)(x-x3)
=(anx - anx1) (x  x2)(x - x3)
=(an x2 _ anxx2  anxx1 + anx1x2)
(x-x3)
=an x3 - an x2x3 - an x2x2+ anxx2x3
 an x2x1 + an xx1x3 + an xx1x2 -
an x1x2x3
=an x3  an x2(x1+x2+x3) + an
x(x1x2 + x1x3+ x2x3) - an (x1x2x3)
DARI PRSAMAAN (1) (4) DAN (6)
an x3  an x2(x1+x2+x3) + an x(x1x2 +
x1x3+ x2x3) - an (x1x2x3)
 DARI PERSAMAAN (1)(4) DAN (6)
DAPAT DISIMPULKAN BAHWA X, Y DAN Z
ADALAH AKAR-AKAR PERSAMAAN
x続 - 6x族 +12x - 8 = 0 sehingga (t - 2)続 = 0
Maka X=Y=Z=2
Jadi semua solusi yang memenuhi sistem
Persamaan tersebut hingga X=Y=Z=2
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TUGAS PROBLEM SOLVING

  • 2. OSN 2002 NOMOR 3 TENTUKAN SEMUA SOLUSI DARI SISTEM PERSAMAAN X + Y+ Z = 6 X族 + Y族 + Z族 = 12 X続 + Y続 + Z続 = 24
  • 3. PENYELESAIAN X + Y+ Z = 6 ..........(1) X族 + Y族 + Z族 = 12....(2) X続 + Y続 + Z続 = 24....(3) KUADARATKAN PERSAMAAN (1) (X + Y+ Z)族 = 6族 X族 + Y族 + Z族 + 2(XY +XZ +YZ) = 36 XY +XZ +YZ = 12...........(4)
  • 4. KALIKAN PERSAMAAN (1) DAN (2) (X + Y+ Z)(X族 + Y族 + Z族) = (6 .12) X続+Y続+Z続+XY族+XZ族+X族Y+X族Z+YZ族+Y族Z=72 XY族+XZ族+X族Y+X族Z+YZ族+Y族Z=48.........(5) KALIKAN PERSAMAAN (1) DAN (4) (X + Y+ Z)(XY +XZ +YZ) =(6.12) XY族+XZ族+X族Y+X族Z+YZ族+Y族Z+3XYZ=72 48 +3XYZ =72 XYZ = 8......(6)
  • 5. RUMUS POLINOM BERDERAJAT 3 an(x-x1)(x-x2)(x-x3) =(anx - anx1) (x x2)(x - x3) =(an x2 _ anxx2 anxx1 + anx1x2) (x-x3) =an x3 - an x2x3 - an x2x2+ anxx2x3 an x2x1 + an xx1x3 + an xx1x2 - an x1x2x3 =an x3 an x2(x1+x2+x3) + an x(x1x2 + x1x3+ x2x3) - an (x1x2x3)
  • 6. DARI PRSAMAAN (1) (4) DAN (6) an x3 an x2(x1+x2+x3) + an x(x1x2 + x1x3+ x2x3) - an (x1x2x3)
  • 7. DARI PERSAMAAN (1)(4) DAN (6) DAPAT DISIMPULKAN BAHWA X, Y DAN Z ADALAH AKAR-AKAR PERSAMAAN x続 - 6x族 +12x - 8 = 0 sehingga (t - 2)続 = 0 Maka X=Y=Z=2 Jadi semua solusi yang memenuhi sistem Persamaan tersebut hingga X=Y=Z=2