Question

Va rooog!!! Efectuati urmatoarele calcule:
a) (2x+5)*(x-1)-3*(x^2 + 2x-3) +x*(x-2)
b) 9x^4 y^4 z^4/ (xyz^2)^2+(-12x^2 y^3 z^4):(-3yz^4)+(3x^2 y^2 z-6x^2 y^2 z) : 3z

Answer 1

a)
2x²-2x+5x-5-3x²-6x+9+x²-2x=-5x+4
b)
$\frac{9 x^{4} y^{4} z^{4} }{ x^{4} y^{4} z^{4} } +\frac{-12x^{2} y^{3} z^{4} }{-3y z^{4} } + \frac{-3 x^{2} y^{2}z }{3z}$
9+4x²y²-x²y²=
9+3x²y²=
3( 3+x²y²)