Question

8x^-9 y^10*1,5x^10 y^-3

Answer 1

$8x^{-9}y^{10} * 1.5x^{10} y^{-3} = (8*1.5) * x^{-9+10} *y^{10+(-3)} = 12x^1y^7= 12xy^7$