Question

Efectuați înmulțirea:
a) 1 / 4 x 2 y * 2 x y;
b) 0,6 a b² * 5a²b;
c) 2x³y * (-1/√2 y);
d)-3√18ab*√2/3 a³b²

Vă rog am nevoie urgent ​

Answer 1

a)

$\displaystyle \frac{1}{2} \cdot x^{2} y\cdot2xy=\frac{2}{4} \cdot x^{3} y^{2}=\frac{1}{2} \cdot x^{3} y^{2}$

b)

0,6ab² · 5a²b = (0,6 · 5) a³b³ = 3a³b³

c)

$\displaystyle 2x^{3} y\cdot\frac{-1}{\sqrt{2} } \cdot y=\frac{-2}{\sqrt{2} } \cdot x^{3} y^{2}=-\sqrt{2} \cdot x^{3} y^{2}$

d)

$\displaystyle -3\sqrt{18} \cdot ab \cdot \frac{\sqrt{2} }{3} \cdot a^{3} b^{2} =\frac{-3\cdot 3\sqrt{2}\cdot\sqrt{2} }{3} \cdot a^{4} b^{3}=-6a^{4} b^{3}$