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a) (x+2) \(\left(x^2-2x+4\right)\)
b) (3 - 2y) \(\left(9+6y+4y^2\right)\)
d) (4x - y) \(\left(16x^2+4xy+y^2\right)\)
bạn giải chi tiết hộ mình với nha.mk sắp phải nộp bài r. huhuhuhu
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) \(1-9x+27x^2-27x^3\)
\(=-\left(27x^3-27x^2+9x-1\right)\)
\(=-\left(3x-1\right)^3\)
\(a,x^3+8y^3=\left(x+2y\right)\left(x^2-2xy+4y^2\right)\)
\(b,a^6-b^3=\left(a^2-b\right)\left(a^4+a^2b+b^2\right)\)
\(c,8y^3-125=\left(2y-5\right)\left(4y^2+10y+25\right)\)
\(d,8z^3+27=\left(2z+3\right)\left(4z^2-6z+9\right)\)
\(a)x^3+8y^3=x^3+\left(2y\right)^3=\left(x+2y\right)\left(x^2-2xy+4y^2\right)\)
\(b)a^6-b^3=\left(a^3-b^3\right)\left(a^3+b^3\right)\)
\(c)8y^3-125=\left(2y\right)^3-5^3=\left(2y-5\right)\left(4y^2+10y+25\right)\)
\(d)8z^3+27=\left(2z\right)^3+3^3=\left(2x+3\right)\left(4z^2-6z+9\right)\)
a)
\(x^5+x^3-x^2-1\)
\(=x^3\left(x^2+1\right)-\left(x^2+1\right)\)
\(=\left(x^2+1\right)\left(x^3-1\right)\)
\(=\left(x^2+1\right)\left(x-1\right)\left(x^2+x+1\right)\)
b)
\(x^2-3x^3-x+3\)
\(=x\left(x-1\right)-3\left(x^3-1\right)\)
\(=x\left(x-1\right)-3\left(x-1\right)\left(x^2+x+1\right)\)
\(=\left(x-1\right)\left(x-3x^2-3x-3\right)\)
\(=\left(x-1\right)\left(-3x^2-2x-3\right)\)
c)
\(x^2-6x+8\)
\(=x^2-2.x.3+9-1\)
\(=\left(x-3\right)^2-1\)
\(=\left(x-3-1\right)\left(x-3+1\right)\)
\(=\left(x-4\right)\left(x-2\right)\)
d)
\(4x^4-4x^2y^2-8y^4\)
\(=\left(2x^2\right)^2-2.\left(2x^2\right)y^2+y^2-9y^4\)
\(=\left(2x^2-y\right)^2-\left(3y^2\right)^2\)
\(=\left(2x^2-y-3y^2\right)\left(2x^2-y+3y^2\right)\)
a,nhóm x*5 với x*3,x*2 và 1: (x*5+ x*3) - (x*2+1) =x*3.(x*2+1)-(x*2+1) =....., câu b nhóm x*2 và -3x*3,x và 3, câu c bang (x-3)*2-1 =..., câu d đat 4 ra.
a) \(x^5+x^3-x^2-1=x^3\left(x^2+1\right)-\left(x^2+1\right)=\left(x^3-1\right)\left(x^2+1\right)\)
b) \(x^2-3x^3-x+3=x\left(x-1\right)-3\left(x^3-1\right)=x\left(x-1\right)-3\left(x-1\right)\left(x^2+x+1\right)=\left(x-1\right)\left[\left(x-3\right)-\left(x^2+x+1\right)\right]=\left(x-1\right)\left(-x^2-4\right)\)c) \(x^2-6x+8=x^2-6x+9-1=\left(x-3\right)^2-1=\left(x-2\right)\left(x-4\right)\)
d) \(4x^4+4x^2y^2-8y^4=4x^4+4x^2y^2+y^4-9y^4=\left(2x^2+y^2\right)^2-9y^4=\left(2x^2+4y^2\right)\left(2x^2-2y^2\right)=2\left(x^2+2y^2\right)2\left(x^2-y^2\right)=4\left(x^2+2y^2\right)\left(x+y\right)\left(x-y\right)\)
BÀi 1 : xem lại đề
bài 2
a) 27 - x^3
= ( 3 -x )( 9 + 3x + x^2)
b) 8x^3 + 0,001
= (2x + 0,1) ( 4x^2 - 0,2x + 0,01)
\(\frac{x^3}{64}-\frac{y^3}{125}=\left(\frac{x}{4}-\frac{y}{5}\right)\left(\frac{x^2}{16}-\frac{xy}{20}+\frac{y^2}{25}\right)\)
a+b=7=>(a+b)2=49
=>a2+2ab+b2=49
Do ab=3
=>2ab=6
=>b2+a2=43
Ta có:a3+b3=(a+b)(a2-ab+b2)
Thay a2+b2=43 ab=3 a+b=7
=> a3+b3=7.(43-3)=7.40=280
a)27-x3=(3-x)(9+3x+x2)
b)8x3+0,001=(2x+0,1)(4x2-0,2x+0,01)
c)x3/64-y3/125=(x/4-y/5)(x2/16+xy/20+y2/25)
\(a,\left(a^3-b^3\right)+\left(a-b\right)^2\)
\(=\left(a-b\right)\left(a^2+ab+b^2\right)+\left(a-b\right)^2\)
\(=\left(a-b\right)\left(a^2+ab+b^2+a-b\right)\)
\(b,\left(x^2+1\right)^2-4x^2\)
\(=x^4+2x^2+1-4x^2\)
\(=x^4-2x^2+1\)
\(\left(x^2-1\right)^2\)
\(c\left(y^3+8\right)+\left(y^2-4\right)\)
\(=\left(y+2\right)\left(y^2-8y+4\right)+\left(y-2\right)\left(y+2\right)\)
\(=\left(y+2\right)\left(y^2-8y+4+y-2\right)\)
\(=\left(y+2\right)\left(y^2-7y+2\right)\)
a) ( a3 - b3) + ( a - b)2
= (a-b) (a2 + ab + b2 ) + (a-b)2
= (a-b) (a2 + ab + b2 +a -b )
hok tốt
2a) \(4x^2-1=\left(2x\right)^2-1^2=\left(2x+1\right)\left(2x-1\right)\)
b) \(x^2+16x+64=\left(x+8\right)^2\)
c) \(x^3-8y^3=x^3-\left(2y\right)^3\)
\(=\left(x-2y\right)\left(x^2+2xy+4y^2\right)\)
d) \(9x^2-12xy+4y^2=\left(3x-2y\right)^2\)
a) \(x^3+8=x^3+2^3=\left(x+2\right)\left(x^2-2x+4\right)\)
b) \(27-8y^3=3^3-\left(2y\right)^3=\left(3-2y\right)\left(9+6y+4y^2\right)\)
c) \(y^6+1=\left(y^2\right)^3+1^3=\left(y^2+1\right)\left(y^4-y^2+1\right)\)