Ta có :
\(a\left(b^2+c^2+bc\right)+b\left(c^2+a^2+ac\right)+c\left(a^2+b^2+ab\right)\)
\(=ab^2+ac^2+abc+bc^2+a^2b+a^2c+b^2c+abc\)
\(=\left(ab^2+a^2b+abc\right)+\left(bc^2+b^2c+abc\right)+\left(ac^2+a^2c+abc\right)\)
\(=ab\left(a+b+c\right)+bc\left(a+b+c\right)+ac\left(a+b+c\right)\)
\(=\left(ab+bc+ac\right)\left(a+b+c\right)\)
A= 2x^2 +2y^2 -x^2y + z -y^2z - 2
Rut gon bieu thuc
mn giup nhanh nha, thanks trc
-x -y^2 - x^2 - y
Rut gon bthuc nay
moi nguoi giup mk nhanh nha ! thanks trc !
rut gon
a,4xn(7xn-1+x-5)-2xn-2(14xn+1-10x2)
b,(a+b+c)(a^2+b^2+c^2-ab-ac-bc)
các bn giúp mk với mk đg caần g
cho a,b,c khac nhau doi mot va 1/a+1/b+1/c=0.rut gon cac bieu thuc
N=bc/a^2+2bc+CA/B^2+2AC+AB/C^2+2AB
Rut gon bieu thuc: (a-b+c)^2+2(a-b+c)(b-c)+(b-c)^2
RUT GON
A=( a2 + b2 + c2 )2 - ( a2 - b2 + c2 )2
B=( a + b + c )2 + ( a + b - c)2 - 2 ( a + b )2
C= ( a + b + c )2 + ( a - b + c )2 + ( a + b - c )2 + ( b + c - a)2
AI BIET THI GIUP VS NHA
Rut gọn phân thức
\(\frac{a^2\left(b-c\right)+b^2\left(c-a\right)+c^2\left(a-b\right)}{ab^2-ac^2-b^3+bc^2}\)
rut gon bieu thuc
(a+b-c)2+(a-b+c)2-2(b-c)2
rut gon bieu thuc
(a+b-c)2+(a-b-c)2+(b-c-a)2+(c-b-a)2
