Question

3/4а^2*4/5b^2 при а = 2, при b= 3/5

Answer 1

$\dfrac34a^2\cdot\dfrac45b^2=\dfrac35a^2b^2$

$\pi pu\ \ a =2; \ \ b =\dfrac35$

$\dfrac35\cdot2^2\cdot\bigg(\dfrac35\bigg)^2=\dfrac35\cdot4\cdot\dfrac{3^2}{5^2}=\dfrac35\cdot4\cdot\dfrac9{25}=\dfrac{3\cdot4\cdot9}{5\cdot25}=\dfrac{108}{125}$