C=47.53=(50-3)(50+3)=50²-3²=2500-9=2491

B=(200-1)²=200²-2.200+1=40000-400+1=39601

B = (200 - 1)² = 200² - 400 + 1 = 39601

`A=4(3^2+1)(3^4+1)...(3^64+1)`

`=>2A=(3^2-1)(3^2+1)(3^4+1)...(3^64+1)`

- Ta có: 

`(3^2-1)(3^2+1)=3^4-1`

`(3^4-1)(3^4+1)=3^16-1`

`....`

`(3^64-1)(3^64+1)=3^128-1`

Suy ra `2A=3^128-1=B`

`=>A<B`

a) Ta có: \(a^3y^3+125\)

\(=\left(ay+5\right)\left(a^2y^2-5ay+25\right)\)

b) Ta có: \(8x^3-y^3-6xy\cdot\left(2x-y\right)\)

\(=\left(2x-y\right)\left(4x^2+2xy+y^2\right)-6xy\left(2x-y\right)\)

\(=\left(2x-y\right)\left(4x^2+2xy-6xy+y^2\right)\)

\(=\left(2x-y\right)^3\)

`1)(a^[1/4]-b^[1/4])(a^[1/4]+b^[1/4])(a^[1/2]+b^[1/2])`

`=[(a^[1/4])^2-(b^[1/4])^2](a^[1/2]+b^[1/2])`

`=(a^[1/2]-b^[1/2])(a^[1/2]+b^[1/2])`

`=a-b`

`2)(a^[1/3]-b^[2/3])(a^[2/3]+a^[1/3]b^[2/3]+b^[4/3])`

`=(a^[1/3]-b^[2/3])[(a^[1/3])^2+a^[1/3]b^[2/3]+(b^[2/3])^2]`

`=(a^[1/3])^3-(b^[2/3])^3`

`=a-b^2`

\(a,=\left(x-1\right)^3\\ b,=\left(1-2x\right)\left(1+2x\right)\\ c,=x^3-8\\ d,=\left(3x-1\right)\left(9x^2+3x+1\right)\\ e,=\left(x+2\right)\left(x^2-2x+4\right)\\ g,=\left(x-2\right)^2\\ h,=x^2-4y^2\\ j,=\left(x-4\right)^2\)

\(=\left(3x\right)^2-2\cdot3x\cdot4+4^2-1\)

\(=\left(3x-4\right)^2-1^2\)

\(=\left(3x-4-1\right)\left(3x-4+1\right)\)

\(=\left(3x-5\right)\left(3x-3\right)\)

a) \(=\left(x-2\right)^2\)

b) \(=\left(2x+1\right)^2\)

c) \(=\left(4x-3y\right)\left(4x+3y\right)\)

d) \(=\left(4-x-3\right)\left(4+x+3\right)=\left(1-x\right)\left(x+7\right)\)

e) \(=\left(2x-3x+1\right)\left(2x+3x-1\right)=\left(1-x\right)\left(5x-1\right)\)

f) \(=\left(x-y\right)\left(x^2+xy+y^2\right)\)

g) \(=\left(x+3\right)\left(x^2-3x+9\right)\)

h) \(=\left(x+2\right)^3\)

i) \(=\left(1-x\right)^3\)

a/ $=(x-2)^2$

b/ $=(2x+1)^2$

c/ $=(4x-3y)(4x+3y)$

d/ $=(1-x)(x+7)$

e/ $=(-x+1)(5x-1)$

f/ $=(x-y)(x^2+xy+y^2)$

g/ $=(3+x)(9-3x+x^2)$

h/ $=(x+2)^3$

i/ $=(1-x)^3$

a: \(x^2-4x+4=\left(x-2\right)^2\)

b: \(4x^2+4x+1=\left(2x+1\right)^2\)

g: \(x^3+27=\left(x+3\right)\left(x^2-3x+9\right)\)