Question

(0,6a+0,32b)a-(0,64b+1,28a)b
(O,09a-0,81b)b-(0,81b-7,29a)a
(4,9x-3,43y)×xy-(3,43y-4,9x)×4

Answer 1

$0.6 {a}^{2} - 0.96ab - 0.64 {b}^{2}$
$- 0.72ab - 0.81 {b}^{2} + 7.29 {a}^{2}$
$( frac{49}{10} times - frac{343}{100} y) times (xy + 4)$