Question

Please solve these questions
It's very necessary
Tomorrow is my test
1 question is most necessary
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Answer 1

x^3+(y+z)^3

=x^3+y^3+z^3+3yz(y+z)

=x^3+y^3+z^3+3y^2z+3yz^2

=(x+y+z)^3+3y^2z+3yz^2

x^3-(y-z)^3

=x^3+(z-y)^3

=x^3+z^3-y^3-3zy(z+y)

=x^3+z^3-y^3-3z^2y-3zy^2

=(x+z-y)^3-3z^2y-3zy^2

8a^3/27-b^3/64

=8a^3/3^3-b^3/4^3

=(8a/3-b/4)^3

=(16a-3b/6)^3

=16a^3-3b^3-3(16a)(3b)(16a+3b)/216

=16a^3-3b^3-3(16a+3b)^2/216

=16a^3-3b^3-768a^2-27b^3+288ab/216