(9分之5加3分之2)乘5分之9 =(5/9)×(9/5)+(2/3)×(9/5)=1+6/5=5分之11祝你开心
(5/9 +2/3)X9/5=(5/9)×(9/5)+(2/3)×(9/5)=1+6/5 =11/5=2又1/5
(5/9 +2/3)*9/5=5/9*9/5 +2/3*9/5 (分配律)=1+6/5=2又1/5
简便运算