-
最佳答案:3/19-7/15+7/15 3/5+5/8+2/5 1/6+(5/9+5/6)=3/19-(7/15-7/15)=(3/5+2/5) +5/8 =(1/6+
-
最佳答案:1.5x+15=755x=75-15x=60÷5x=122.3/5x-1/4x=7/10(3/5-1/4)x=7/107/20x=7/10x=7/10÷7/20