5/8×2/3=10/24 10/24×9/5=3/4 5/12×4/5=1/3 1/3×9/2=3/2=1,5
3-0,5=2,5
(2/3)×4+ (1/4)×3=11/12 11/12×6/15=11/30
5/8×2/3=10/24 10/24×9/5=3/4 5/12×4/5=1/3 1/3×9/2=3/2=1,5
3-0,5=2,5
(2/3)×4+ (1/4)×3=11/12 11/12×6/15=11/30