1/4÷9/5＋5/9＋3/4 ⊙ε⊙ =1/4×5/9＋5/9×3/4 ⊙ε⊙ =5/9×（1/4 3/4） ⊙ε⊙ =5/9 ⊙ε⊙ 6/5-4/9-5/12×4/3 ⊙υ⊙。 =6/5－4/9－5/3×1/3 ⊙υ⊙ =6/5-4/9-5/9 ⊙υ⊙ =6/5-1 ⊙υ⊙ =1/5 ⊙ω⊙ OK啦～
