数学简算题:8/9x5/9+1/9÷7/5，8/9×5/9+1/9÷7/5＝8/9×5/9+1/9×5/7＝8/9×5/9+5/9×1/7＝（8/9+1/7）×5/9＝65/63×5/9＝325/567
一道数学简算题:8/9x5/9+1/9÷7/5=8/9x5/9+1/9x5/7=8/9x5/9+5/9x1/7=(8/9十1/7)x5/9=65/63x5/9=325/567
