Toán Lớp 8: (x+3)^3-9x(x-3)
Giải giúp em ạh cảm ơn mn
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Toán Lớp 8: (x+3)^3-9x(x-3)
Giải giúp em ạh cảm ơn mn
Comments ( 2 )
=(x)^3+3(x)^2(3)+3(x)(3)^2+(3)^3-(9x^2 -27x)
=x^3+9x^2+27x+27-9x^2+27x
=x^3+9x^2-9x^2+27x+27x+27
=x^3+54x+27