Simplemente puedes calcular 0,24×1,2×1500,8×0,9÷0,8×0,99×4,38 12×98 8,12×26,4×(0,65438.

=(0,24×30)×(1,2×5)

=7,2×6

=43,2

0,8×0,9÷0,8×0,9

=(0,8÷0,8)×(0,9×0,9)

=1×0,81

=0,81

9,9×4,3

=10×4,3-0,1×4,3

=43-0,43

=42,57

8,12 ×98 8,12×2

=8,12×(98 2)

=8,12×100

=812

6,4×(0,125 12,5)

=0,8×8×(0,125 12,5)

=0,8×(8×0,125 8×12,5)

=0,8×(1 100)

=0,8×1 0,8×100

=0,8 80

=80,8

4,2×75÷25

=4,2×(75÷25)

=4,2×3

=12,6