a^3 + b^3 +c^3 - 3abc
= ( a + b )^3 - 3ab ( a + b ) + c^3 - 3abc
= [ ( a + b )^3 + c^3 ] + [ -3ab ( a + b ) - 3abc ]
= ( a + b + c ) * [ ( a + b )^2 - c*( a + b ) + c^2 ] - 3ab ( a + b + c )
= ( a + b + c ) * ( a^2 + 2ab + b^2 - ac - bc + c^2 - 3ab )
= (a + b + c) * ( a^2 + b^2 + c^2 - ab - ac - bc )
phan tich da thuc thanh nhan tu
a3+b3+c3-3abc
a^3(b-c)+ b^3(c-a)+c^3(a-b) phan tich da thuc thanh nhan tu
phan tich da thuc thanh nhan tu a(b^3-c^3)+b(c^3-a^3)+c(a^3-b^3)
phan tich da thuc thanh nhan tu
A2-B2-C2-3ABC = ?
ab(a+b)+bc(b+c)+ca(c+a)+3abc phan tich da thuc thanh nhan tu cac ban vao giup minh vs vao trong tuong cua minh ai giup minh cho 2 like luon
PHAN TICH DA THUC THANH NHAN TU
B= X^3+Y^3+Z^3-3XYZ
phan tich da thuc thanh nhan tu
\(\left(\text{a}+b+c\right)^3-\text{a}^3-b^3-c^3\)
Phan tich da thuc thanh nhan tu
a(a+2b)^3-b(2a+b)^3
phan tich da thuc thanh nhan tu a(b^2+c^2)+b(c^2+a^2)+c(a^2+b^2)-2abc-a^3-b^3-c^3.
