Chứng minh:
a) \(\left(a-b\right)^3=-\left(b-a\right)^3\)
b) \(\left(-a-b\right)^2=\left(a+b\right)^2\)
c) \(\left(x+y\right)^3=x\left(x-3y\right)^2+y\left(y-3x\right)^2\)
d) \(\left(x+y\right)^3-\left(x-y\right)^3=2y\left(y^2+3x^2\right)\)
Loga
Toán lớp 8
