(382+498×381)/(382×498-116)
=(382+498×381)/(381×498+498-116)
=(382+498×381)/(381×498+382)
=1
51又2/3×3/5+71又3/4×4/7+91又4/5×5/9
=(50+5/3)×3/5+(70+7/4)×4/7+(90+9/5)×5/9
=50×3/5+5/3×3/5+70×4/7+7/4×4/7+90×5/9+9/5×5/9
=30+1+40+1+50+1
=123
(382+498×381)/(382×498-116)
=(382+498×381)/(381×498+498-116)
=(382+498×381)/(381×498+382)
=1
51又2/3×3/5+71又3/4×4/7+91又4/5×5/9
=(50+5/3)×3/5+(70+7/4)×4/7+(90+9/5)×5/9
=50×3/5+5/3×3/5+70×4/7+7/4×4/7+90×5/9+9/5×5/9
=30+1+40+1+50+1
=123