Question

2/5:[(1/5-1/9+4/9)-1/2]​

Answer 1

2/5:[(1/5-1/9+4/9)-1/2]=

2/5:[(1/5+3/9)-1/2]=

2/5:[(9/45+15/45)-1/2]=

2/5:(24/45-1/2)=

2/5:(48/90-45/90)=

2/5:3/90=

2/5×90/3=

2×18/3=

2×6=12