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Scrieti expresia in forma cea mai simpla,reducind termenii asemenea:
a)(3x+1)³-(2x-1)³;
b)(3x-1)³+(3x+1)³+(3x+2)³;
c)(2k-3)³+(2k-1)³-(2k+1)³-(2k+3)³;
d)(x+1/2-x+2/3)[(x+1/2)²+(x+1)(x+2)/6+(x+2/3²]-x³/8+x³/27.
dau coronita!!!!!!!urgent