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1) Có 3 = (22 - 1)
=> BT = (22 - 1)(22 + 1)(24 + 1)(28 + 1)(216 +1)
= (24 - 1)(24 + 1)(28 + 1)(216 +1)
= (28 - 1)(28 + 1)(216 +1)
= (216 - 1)(216 +1)
= 232 - 1
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a) \(x^6-y^6=\left(x^3-y^3\right)\left(x^3+y^3\right)=\left(x+y\right)\left(x-y\right)\left(x^2-xy+y^2\right)\left(x^2+xy+y^2\right)\)
b) \(x^6-y^3=\left(x^2-y\right)\left(x^4+x^2y+y^2\right)\)
c) \(x^4-27x=x\left(x^3-27\right)=x\left(x-3\right)\left(x^2+3x+9\right)\)
d) \(27x^5+x^2=x^2\left(27x^3+1\right)=x^2\left(3x+1\right)\left(9x^2-3x+1\right)\)
e) \(x^8-x^2=x^2\left(x^4-1\right)=x^2\left(x^2-1\right)\left(x^2+1\right)=x^2\left(x-1\right)\left(x+1\right)\left(x^2+1\right)\)
f) \(\left(x+y\right)^3-x^3-y^3=3x^2y+3xy^2=3xy\left(x+y\right)\)
g) \(\left(x+y\right)^3-\left(x-y\right)^3=\left(x+y-x+y\right)\left(x^2+2xy+y^2+x^2-y^2+x^2-2xy+y^2\right)\)
\(=2y\left(2x^2+2y^2+x^2-y^2\right)\)
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\(x^2-7x+12=x^2-3x-4x+12=x\left(x-3\right)-4\left(x-3\right)=\left(x-3\right)\left(x-4\right)\)
\(x^2-2x-3=x^2+x-3x-3=x\left(x+1\right)-3\left(x+1\right)=\left(x+1\right)\left(x-3\right)\)
\(x^2+3x-18=x^2-3x+6x-18=x\left(x-3\right)+6\left(x-3\right)=\left(x-3\right)\left(x+6\right)\)
a,x2-7x+12=(x-4)(x-3)
b,3x2+13x-10=(3x-2)(x+5)
c,x2-2x-3=(x-3)(x+1)
d,x2+3x-18=(x-3)(x+6)
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a) \(x^3+6x^2+12x+8\)
\(=\left(x+2\right)^3\)
b) \(x^3-3x^2+3x-1\)
\(=\left(x-1\right)^3\)
c) \(1-9x+27x^2-27x^3\)
\(=-\left(27x^3-27x^2+9x-1\right)\)
\(=-\left(3x-1\right)^3\)
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\(8-27x^3\)
\(=2^3-\left(3x\right)^3\)
\(=\left(2-3x\right)\left(4+6x+9x^2\right)\)
a) \(8-27x^3=\left(2-x\right)\left(4+6x+9x^2\right)\)
b) \(27+27x+9x^2+x^3=\left(3+x\right)^3\)
c) \(x^3+8y^3=\left(x+2y\right)\left(x^2-2xy+4y^2\right)\)
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a, \(x^3-3x^2+3x-1=\left(x-1\right)^3\)
b, \(1-9x+27x^2-27x^3=-\left(3x-1\right)^3\)
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a) Áp dụng hằng đằng thức hiệu của 2 bình phương ta có
\(x^2-7=x^2-\left(\sqrt{7}\right)^2=\left(x-\sqrt{7}\right)\left(x+\sqrt{7}\right)\)
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a) 1 - 2y + y2
= (1-y)2
b) ( x + 1 )2 - 25
=( x + 1 )2 - 52
=(x+1+5)(x+1-5)
Ta có: \(8-27x^6y^3\)
\(=2^3-\left(3x^2y\right)^3\)
\(=\left(2-3x^2\right)\left(4+6x^2y+9x^4y^2\right)\)
\(8-27x^6y^3\)
\(=2^3-\left(3x^2y\right)^3\)
\(=\left(2-3x^2y\right)\left(4+6x^2y+9x^2y^2\right)\)