(5\9×4\7+4\7)÷4\7
=（5/9+1）x4/7÷4/7
=14/9x1
=14/9
=1又5/9
如果本题有什么不明白可以追问,九分之五为什么要加一呀？5\9×4\7+4\7=5\9×4\7+4\7x1=(5/9+1)x4/7