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** Sửa: $125x^3-5x-3y+27y^3$
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Lời giải:
$125x^3-5x-3y+27y^3=(125x^3+27y^3)-(5x+3y)$
$=[(5x)^3+(3y)^3]-(5x+3y)$
$=(5x+3y)(25x^2-15xy+9y^2)-(5x+3y)$
$=(5x+3y)(25x^2-15xy+9y^2-1)$
`#3107.101107`
a)
`A = 2x^2 + 5x^3 + x^2y`
`= x^2 * (2 + 5x + y)`
b)
`5x(x - 1) + 15(x - 1)`
`= (5x + 15)(x - 1)`
`= 5(x + 3)(x - 1)`
\(x^4-5x^2+4=\left(x^2-4\right)\left(x^2-1\right)=\left(x-2\right)\left(x+2\right)\left(x-1\right)\left(x+1\right)\)
[ (x+2)^2 + 5]^2 +3x^3 + 14x^2 + 24x
= (x+2)^4 + 8[(x+2)]^2 + 16 + (3x^2).(x+2) + 8x(x+2) +8x
=(x+2).[(x+2)^3 +8(x+2) + 3x^2 +8x +8 ]
=(x+2).[x^3 + 9x^2 + 28x +32 ]
=(x+2).(x+4).(x^2 +5x +8)
các bạn ơi làm ơn giải hộ mình bài này mình đang cần rất rất gấp
a) \(=\left(x^2-6\right)\left(x^2-1\right)=\left(x^2-6\right)\left(x-1\right)\left(x+1\right)\)
b) \(=\left(x^2-1\right)\left(x^2+3\right)=\left(x-1\right)\left(x+1\right)\left(x^2+3\right)\)
c) \(=x^2\left(x-1\right)-x\left(x-1\right)+4\left(x-1\right)=\left(x-1\right)\left(x^2-x+4\right)\)
a, x^2 + 2x - 8
= x^2 -2x + 4x - 8
= x(x - 2) + 4(x - 2)
= (x + 4)(x - 2)
b, x^2 + 5x + 6
= x^2 + 2x + 3x + 6
= x(x + 2) + 3(x + 2)
= (x + 3)(x + 2)
a/ \(x^2+2x-8\)
\(=x^2+4x-2x-8\)
\(=\left(x^2+4x\right)-\left(2x+8\right)\)
\(=x\left(x+4\right)-2\left(x+4\right)\)
\(=\left(x-2\right)\left(x+4\right)\)
b/ \(x^2+5x+6\)
\(=x^2+2x+3x+6\)
\(=\left(x^2+2x\right)+\left(3x+6\right)\)
\(=x\left(x+2\right)+3\left(x+2\right)\)
\(=\left(x+2\right)\left(x+3\right)\)
a, Cách 1 : \(x^2+5x+6=x^2+2x+3x+6=\left(x+2\right)\left(x+3\right)\)
Cách 2 : \(x^2+5x+6=x^2+2.\frac{5}{2}x+\frac{25}{4}-\frac{25}{4}+6\)
\(=\left(x+\frac{5}{2}\right)^2-\frac{1}{4}=\left(x+2\right)\left(x+3\right)\)
b, Cách 1 : \(x^2-x-6=x^2+2x-3x-6=\left(x-3\right)\left(x+2\right)\)
Cách 2 : \(x^2-x-6=x^2-x+\frac{1}{4}-\frac{1}{4}-6=\left(x-\frac{1}{2}\right)^2-\frac{25}{4}=\left(x-3\right)\left(x+2\right)\)
c, Cách 1 : \(x^2+6x+8=x^2+4x+2x+8=\left(x+2\right)\left(x+4\right)\)
Cách 2 : \(x^2+6x+8=x^2+6x+9-1=\left(x+3\right)^2-1=\left(x+2\right)\left(x+4\right)\)
d, Cách 1 : \(x^2-2x-8=x^2+2x-4x-8=\left(x-4\right)\left(x+2\right)\)
Cách 2 : \(x^2-2x-8=x^2-2x+1-9=\left(x-1\right)^2-9=\left(x-4\right)\left(x+2\right)\)
\(A=5x^3-125x=5x\left(x-5\right)\left(x+5\right)\)
\(B=x^3-8+\left(x-2\right)\left(5x+4\right)\)
\(=\left(x-2\right)\left(x^2+2x+4+5x+4\right)\)
\(=\left(x-2\right)\left(x+2\right)\left(x+4\right)\)
Cảm ơn bạn nhiều nha