Rút gọn:

a) \(\left(3x-1\right)^3-\left(1+2x\right)^3\)

b)\(\left(3x-1\right)\left(9x^2+3x+1\right)-\left(5x+1\right)\left(25x^2-5x+1\right)\)

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B.S

C.Đ

D.Đ