51又2/3÷5/3+71又3/4÷7/4+91又4/5÷9/5的简便运算

51又2/3÷5/3+71又3/4÷7/4+91又4/5÷9/5的简便运算
51又2/3÷5/3+71又3/4÷7/4+91又4/5÷9/5的简便运算

51又2/3÷5/3+71又3/4÷7/4+91又4/5÷9/5的简便运算
51又2/3÷5/3＋71又3/4÷7/4＋91又4/5÷9/5＝51又2/3×3/5＋71又3/4×4/7＋91又4/5×5/9 ＝51×3/5＋2/3×3/5＋71×4/7＋3/4×4/7＋91×5/9＋4/5×5/9 ＝153/5＋2/5＋284/7＋3/7＋455/9＋4/9 ＝155／5＋287／7＋459／9 ＝31＋41＋51 ＝123