如题所述
2/5+x=5/6 方法一:
方程每项同乘30:12+30x = 25
30x = 25-12
30 x =13
x = 13/30
方法二:通分(同理)
x = 5/6 -2/5
x = 25/30 - 12/30
望采纳,谢谢!!