六年級數學：分數混合簡便運算.很急！今晚就要用的！麻煩快一點好嗎？ 1/7×6/13+8/13×1/7=？2-5/11÷9/22-5/9=？（5/6-3/4）÷5/12+9/5=？把過程也寫出來啊~~線上等待、、謝了！

1/7×6/13+8/13×1/7=（6/13 + 8/13）X 1/7 = 14/13 x 1/7 = 2/132-5/11÷9/22-5/9= 2 - 5/11 * 22/9 - 5/9 = 2-（5*22）/（9*11）- 5/9= 2 - 5/9（22/11 + 1）= 2 - 5/9 * 3 = 2- 5/3 = 1/3（5/6-3/4）÷5/12+9/5=？=（5…