Question

Khai triển hằng đẳng thức 

a)\(\left(\frac{1}{2}x+1\right)^2\)

b)\(\left(2x-\frac{1}{3}\right)^3\)

Answer 1

a\(=\frac{1}{4}x^2+2.\frac{1}{2}x.1+1=\frac{1}{4}x^2+x+1\)

b\(=4x^2-2.2x.\frac{1}{3}+\frac{1}{9}=4x^2-\frac{4}{3}x+\frac{1}{9}\)

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Answer 2

a/\(\left(\frac{1}{2}x+1\right)^2=\frac{1}{4}x^2+x+1^2\)

b/\(\left(2x-\frac{1}{3}\right)^3=8x^3-2x+\frac{2}{3}x-\frac{1}{27}\)

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