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a fost răspuns

Efectuati:
a) (-2x) · (3x²) · (-4[tex] x^{4} [/tex]) : (-20[tex] x^{6} [/tex]) ;
b) (4a³ - 5ax - 1) · 7ax²;
c) -5x²(3x ²+2x -4) ;
d) 2,5ab²(8a² - 4b) ;
e) (1,08[tex] ab^{4}- 2 \frac{1}{2} a^{3} b^{3} [/tex] + 4a³b3) : (2ab) ;
f) ([tex]( \frac{2}{3} m^{7} n^{3} - \frac{3}{8} m^{5} n^{2} + \frac{5}{9} m^{4} ) : (- \frac{3}{4} m^{4} ) ;[/tex]
va rogg ajutatima , e urgent . va roog

Răspuns :

Renatemambouko
a) (-2x) · (3x²) · (-4x⁴) : (-20x⁶) =20x⁷: (-20x⁶)=-x
b) (4a³ - 5ax - 1) · 7ax²=28a⁴x²-35a²x³- 7ax²
 c) -5x²(3x ²+2x -4) = -15x⁴-10x³ +20x²
d) 2,5ab²(8a² - 4b) =20a³b²-10ab³
e) (1,08ab⁴-2 1/2a³b³+4a³b³):(2ab) =(0,54b³-5/4a²b²+2a²b²) =0,54b³+3/4a²b² 
 f) (2/3m⁷n³-3/8m⁵n²+5/9m⁴):(-3/4m²)= (2/3m⁷n³-3/8m⁵n²+5/9m⁴)x(-4/3m²)=
=-8/9m⁵n³+1/2m³n²-20/27m²




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