a)  \(x+y=1\)

=>   \(\left(x+y\right)^3=1\)

<=>  \(x^3+y^3+3xy\left(x+y\right)=1\)

<=>  \(x^3+y^3+3xy=1\)

b)  \(x-y=1\)

=>  \(\left(x-y\right)^3=1\)

<=>  \(x^3-y^3-3xy\left(x-y\right)=1\)

<=>  \(x^3-y^3-3xy=1\)

x^3+ y^3+ 3xy

=(x+y)(x^2 -xy + y^2 ) + 3xy
=x^2  -xy + y^2 + 3xy

=x^2 + 2xy + y^2

=(x+y)^2 =1

=> x^3+ y^3+ 3xy=1

còn câu b ai giúp m vs

   \(A=x^3+3xy+y^3\)

       \(=\left(x+y\right)\left(x^2-xy+y^2\right)+3xy\)

       \(=1.\left(x^2-xy+y^2\right)+3xy\)

       \(=x^2-xy+y^2+3xy\)

       \(=x^2+2xy+y^2\)

       \(=\left(x+y\right)^2\)

       \(=1\)

Ta có:
\(x^3+3xy-y^3=x^3-y^3+3xy=\left(x-y\right)\left(x^2+xy+y^2\right)+3xy\)

\(=-\left(x^2+xy+y^2\right)+3xy=-x^2-xy+y^2+3xy=-x^2+2xy+y^2=y^2+2xy-x^2\)
\(=-\left(y^2-2xy+x^2\right)=-\left(y-x\right)^2=-\left(x-y\right)^2=-\left(-1\right)^2=-1\)

tick đúng nha

x³+y³=x³+3x²y+3xy²+y²+3xy-3x²y-3xy²

=(x+y)³+3xy.(1-x-y)

=(x+y)³+3xy.[1-(x+y)]

=1³+3xy.(1-1)

=1

1³ - 3xy . (1-1) = 1 

>_< chúc bn học tốt

Ta có

\(\left(x+x\right)^3=x^3+3x^2y+3xy^2+y^3=x^3+y^3+3xy\left(x+y\right)\)

\(\Rightarrow x^3+y^3=\left(x+y\right)^3-3xy\left(x+y\right)\)

\(\Rightarrow K=\left(x+y\right)^3-3xy\left(x+y\right)+3xy\) Với x+y=1

\(\Rightarrow K=1^3-3xy+3xy=1\)

a) \(A=x^3+y^3+3xy\)

\(=x^3+y^3+3xy\left(x+y\right)\) (do \(x+y=1\))

\(=x^3+3x^2y+3xy^2+y^3\)

\(=\left(x+y\right)^3\) \(=1\)

b) \(B=x^3-y^3-3xy\)

\(=x^3-y^3-3xy\left(x-y\right)\) (do \(x-y=1\))

\(=x^3-3x^2y+3xy^2-y^3\)

\(=\left(x-y\right)^3\) \(=1\)

\(Q=x^3-y^3-3xy\)

\(\Rightarrow Q=\left(x-y\right)\left(x^2+xy+y^2\right)-3xy\)

\(\Rightarrow Q=x^2+xy+y^2-3xy\)

\(\Rightarrow Q=x^2-2xy+y^2=\left(x-y\right)^2\)

\(\Rightarrow Q=1^2=1\)

\(Q=\left(x-y\right)\left(x^2+xy+y^2\right)-3xy=x^2+xy+y^2-3xy\)

\(x^2+y^2-2xy=\left(x-y\right)^2=1^2=1\)