a3 + b3 + c3 - 3abc
= (a3 + 3a2b + 3ab2 + b3 ) + c3 - 3abc - 3a2b - 3ab2
=[(a+b)3 + c3 ]- (3abc+3a2b+3ab2)
=(a+b+c)[(a+b)2 - (a+b)c + c2 ] - 3ab(c+a+b)
=(a+b+c)(a2+2ab+b2-ac-bc+c2)-3ab(a+b+c)
=(a+b+c)(a2+2ab+b2-ac-bc+c2-3ab)
=(a+b+c)(a2+b2+c2-ab-bc-ca)
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 tic h da thuc thanh nhan tu
A^3+b^3+c^3-3abc
phan tich da thuc thanh nhan tu:x^8+64
Phan tich da thuc thanh nhan tu : x2 - 4x -y2+4
bai1:phan tich da thuc thanh nhan tu a)5x3y-10x2y2+5xy3 b)x32y-1-125 2y-1 c)x2-6x-4y2+9 d)x2-xy+2y-2x
phan tich da thuc thanh nhan tu x^3 - 64
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
Phan tich da thuc thanh nhan tu :x^2+7x-15