Tim x biết: a) \( (x+2)(x^2-2x+4) - (x-2)(x^2+2x+4) = 4x \); b) \( x(x-1)(x+1) = (x+3)(x^2-3x+9); \) c) \( x^3 + (1+x)^3 - (2x+1)(x+1) = 0; \) d) \( (2x-1)^3 - 8x^3 = (1-3x)(4x+1); \)
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Tim x biết:
a) \( (x+2)(x^2-2x+4) - (x-2)(x^2+2x+4) = 4x \);
b) \( x(x-1)(x+1) = (x+3)(x^2-3x+9); \)
c) \( x^3 + (1+x)^3 - (2x+1)(x+1) = 0; \)
d) \( (2x-1)^3 - 8x^3 = (1-3x)(4x+1); \)