Toán Lớp 8: (3x+1)³-3(3x+1).(3x-1)
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Toán Lớp 8: (3x+1)³-3(3x+1).(3x-1)
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Comments ( 2 )
=27x^3+27x^2+9x+1-27x^2+3
=27x^3+(27x^2-27x^2)+9x+(1+3)
=27x^3+9x+4