\(=\frac{\left(a-b\right)^3-c^3+3ab\left(a-b\right)-3abc}{a^2+2ab+b^2+b^2-2bc+c^2+c^2+2ca+a^2}\)

\(=\frac{\left(a-b-c\right)\left(a^2-2ab+b^2+ac-bc+c^2\right)+3ab\left(a-b-c\right)}{\left(a-b-c\right)^2+a^2+b^2+c^2}\)

\(=\frac{\left(\cdot a-b-c\right)\left(a^2+b^2+c^2+ac+ab-bc\right)}{4+a^2+b^2+c^2}\)

\(=\frac{2a^2+2b^2+2c^2+2ab-2bc+2ca}{4+a^2+b^2+c^2}\)

\(=\frac{\left(a-b-c\right)^2+a^2+b^2+c^2}{4+a^2+b^2+c^2}=1\)

k mk nha

Tổng bằng :

1000 + 1000 = 2000

Đáp số : 2000

1000+1000

=2000

2000

=1000+1000

tíc mình nha

bằng 102 nhé hi hi hi

x = 57 - 42

x =  15

9555554

kb ko?

2001 

____

1991

321-123=198

666666 + 8888888 = 9555554

\(x+91=11\)

\(x=11-91\)

\(x=-80\)

k nha mình k lại