Question

计算:(根号3a-3倍根号27a3)÷根号3分之a

Answer 1

[√(3a)-3√(27a^3)]÷(√a/3)

=[√(3a)-9a√(3a)]÷(√a/√3)

=√(3a)[1-9a]*√3/√a

=√3*[1-9a]*√3

=3*(1-9a)

=3-27a