x4 + 1024 = x4 + 64x2 + 1024 - 64x2
= (x2 + 32)2 - (8x)2
= (x2 - 8x + 32)(x2 + 8x + 32)
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x4 + 1024 = x4 + 64x2 + 1024 - 64x2
= (x2 + 32)2 - (8x)2
= (x2 - 8x + 32)(x2 + 8x + 32)
biết, ptđttnt
x7 + x + 1
PTĐTTNT: x5+x4+1
ptđttnt:
x10+x5+1
PTĐTTNT
(x+2)(x+3)(x+4)(x+5)-24
ptđttnt x3+y3+z3-3xyz
1 PTĐTTNT
a, x8+x+1
b, x7+x2+1
c, x7+x5+1
1.(x2+3).(x4-3x2+9)
2.(2x+1).(4x2-2x+1)
3.(x2+2).(x4-2x2+4)
4.(3x+2).(9x2-6x+4)
tìm x
4-x=2.(x-4)^2
Chứng minh rằng : x4 +y4+z4 > hoặc = ( x2+y2+z2) : 3