Question

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

Answer 1

a) (3x+1)³-(2x-1)³=[(3x)³+3×3x×1+1³]-[(2x)³-3×2x×1+1²]=(27x³+9x+1)-(8x³-6x+1)
b) ...