a, 7x2 + 6x - 13
b,15(x-y) - 25x + 25y
c, 36 - 4a2 + 20ab - 25b2
1. a3 b3 c3 3abc2. a10 a5 13. a8 a 14. a8 a7 15. a16 a8b8 b166. a 1 a 3 a 5 a 7 157. 4x2y2 2x y y2z2 z y x2z2 2x z 8. be a b b c ac b d a c ab c d a b 9. x y 3 y z 3 z x 310. x4 6x3 7x2 6x 1
3 3 3 3 3 3 3 3 3 3 3 3 3
Phân tích các đa thức sau thành nhân tử:
a,36 - 12x + x mũ 2
b,4x mũ 2 + 12x + 9
c,-25x mũ 6 - y mũ 8 + 10x mũ 3 y mũ 4
d,1/4x mũ 2 - 5xy + 25y mũ 2
a) \(36-12x+x^2\) \(=6^2-2.6.x+x^2\)
\(=\left(6-x\right)^2\)
b) \(4x^2+12x+9=\left(2x\right)^2+2.2x.3+3^2\)
\(=\left(2x+3\right)^2\)
c) \(-25x^6-y^8+10x^3y^4=-\left[25x^6-10x^3y^4+y^8\right]\)
\(=-\left[\left(5x^3\right)^2-2.5x^3.y^4+\left(y^4\right)^2\right]\)
\(=-\left(5x^3-y^4\right)^2\)
d) \(\dfrac{1}{4}x^2-5xy+25y^2=\left(\dfrac{1}{2}x\right)^2-2.\dfrac{1}{2}x.5y+\left(5y\right)^2\)
\(=\left(\dfrac{1}{2}x-5y\right)^2\)
Học tốt~~~
Phân tích các đa thức sau thành nhân tử:
a,36 - 12x + x mũ 2
b,4x mũ 2 + 12x + 9
c,-25x mũ 6 - y mũ 8 + 10x mũ 3 y mũ 4
d,1/4x mũ 2 - 5xy + 25y mũ 2
a. \(36-12x+x^2=6^2-2.6.x+x^2=\left(6-x\right)^2\)
b. \(4x^2+12x+9=\left(2x\right)^2+2.2x.3+3^2=\left(2x+3\right)^2\)
c: \(=-\left(25x^6-10x^3y^4+y^8\right)\)
\(=-\left(5x^3-y^4\right)^2\)
d: \(=\left(\dfrac{1}{2}x\right)^2-2\cdot\dfrac{1}{2}x\cdot5y+\left(5y\right)^2=\left(\dfrac{1}{2}x-5y\right)^2\)
Viết các đa thức sau thành tích:
M=12xz -5xy
N=64^2-49
P=25y^2-16z^2
Q=4-25y^2
R=25x^2-10x+1
O=16-8y+y^2
X=1-6x+9x^2
\(M=12xz-5xy=x\left(12z-5y\right)\)
\(N=64^2-49=64^2-7^2=\left(64-7\right)\left(64+7\right)\)
\(P=25y^2-16z^2=\left(5y\right)^2-\left(4z\right)^2=\left(5y-4z\right)\left(5y+4z\right)\)
\(Q=4-25y^2=2^2-\left(5y\right)^2=\left(2-5y\right)\left(2+5y\right)\)
\(R=25x^2-10x+1=\left(5x-1\right)^2\)
\(O=16-8y+y^2=\left(4-y\right)^2\)
\(X=1-6x+9x^2=\left(1-3x\right)^2\)
chuyển đổi đa thức thành tích
a) 6x2 - 3xy
b) 12xz - 5y
c) 64x2 - 49
d) 25y2 - 16z2
e) 4 - 25y2
f) 25x2 - 10x + 1
g) 16 - 8y + y2
h) 1 - 6x + 9x2
\(a,6x^2-3xy=3x\left(2x-y\right)\)
\(b,12xz-5y=y\left(12x-5\right)\)
\(c,64x^2-49=\left(8x\right)^2-7^2=\left(8x-7\right)\left(8x+7\right)\)
\(d,25y^2-16z^2=\left(5y\right)^2-\left(4z\right)^2=\left(5y-4z\right)\left(5y+4z\right)\)
\(e,4-25y^2=2^2-\left(5y\right)^2=\left(2-5y\right)\left(2+5y\right)\)
\(f,25x^2-10x+1=\left(5x\right)^2-5x\cdot2\cdot1+1=\left(5x-1\right)^2\)
\(g,16-8y+y^2=4^2-4\cdot2\cdot y+y^2=\left(4-y\right)^2\)
\(h,1-6x+9x^2=1^2-6\cdot2\cdot x+\left(3x\right)^2=\left(1-3x\right)^2\)
c)x^4-4x^2y^2+y^2+2xy
d)7x^2-14xy^2+7y^4
e)2xy-15-6x+5y
g)9x^2-25y^2-6x+10
c: \(x^2-4x^2y^2+y^2+2xy\)
\(=\left(x+y\right)^2-\left(2xy\right)^2\)
\(=\left(x+y+2xy\right)\left(x+y-2xy\right)\)
d: \(7x^2-14xy^2+7y^4\)
\(=7\left(x^2-2xy^2+y^4\right)\)
\(=7\left(x-y^2\right)^2\)
49x-xy^2+4xy-4x
(a-b)^2-(b-a)(a-3b)
15x(x-y)-25x+25y
-y^2+1/9
15x(x-y)-25x-25y
a.4x2+28x+49
b.16y2-8y+1
c.4a2+20ab+25b2
d.9x2-6xy+y2
\(a,4x^2+28x+49=\left(2x\right)^2+2.2x.7+7^2=\left(2x+7\right)^2\\ b,16y^2-8y+1=\left(4y\right)^2-2.4y.1+1^2=\left(4y-1\right)^2=\left(1-4y\right)^2\\ 4a^2+20ab+25b^2=\left(2a\right)^2+2.2a.5b+\left(5b\right)^2=\left(2a+5b\right)^2\\ d,9x^2-6xy+y^2=\left(3x\right)^2-2.3x.y+y^2=\left(3x-y\right)^2=\left(y-3x\right)^2\)