a)x2-2xy+y2-2x+2y
=(x2-2xy+y2-2x+2y+1)-1
=(x-y-1)2-1
=(x-y-2)(x-y)
b)x3-49x
=x(x2-72)
=x(x+7)(x-7)
c)x2-y2+6x+9
=(x2+6x+9)-y2
=(x+3)2-y2
=(x-y+3)(x+y+3)
d)x2-6x+5
=x2-5x-x+5
=x(x-5)-(x-5)
=(x-1)(x-5)
(x^2+x)^2+3(x^2+x)+2
x^2+2xy+y^2+2x+2y-15
phan tich da thuc thanh nhan tu
phan tich da thuc thanh nhan tu
a) xy-y2+2x-2y
b) x2+2xy+y2-9
Phan tich da thuc x^2 + y^3 + 2x^2 -2cy + 2y^2 thanh nhan tu
phan tich da thuc thanh nhan tu
x^2+6x+9
10x-25-x^2
8x^3-1/8
8x^3+12x^2+6xy^2+y^3
phan tich da thuc thanh nhan tu
A=x^6-2x^5-4x^4+6x^3+4x^2-2x-1
phan tich da thuc thanh nhan tu
a) 2a(x+y)+y+x
b) 2(x-y)^2-x+y
c) x^2-xy-3x+3y
d) ax^2+6x^2-6x-ax+a+b
2) phan tich da thuc thanh nhan ( nhieu phuong phap)
a) 5a^2+20a+20 c) 25-x^2+2xy-y^2
b) 5a^2-10ab+5b^2 d) m^2+2mn+n^2-p^2
Phan tich da thuc thanh nhan tu:
1)P= 9(x+3)^2 - 4(x-2)^2
2) P= 25(2x-y)^2 - 16(x+2y)^2
phân tich da thuc thanh nhan tu
1)x^3 +x^3y - x^3z - xyz
2)5xy^3 + 30x^2 z^2 - 6x^3 yz - 25y^2 z
3)25x^2-1/8x^2y^2
4)a^3x-ab+b-x
phan tich da thuc thanh nhan tu
x^2-x-y^2-y
x^2-2xy+y^2-z^2
bai 32 va 33 sbt
lop 8 bai phan tich da thuc thanh nhan tu bang cach nhom hang tu
