1.=54*(1/9)+(9/13)/(1/9)
=6+(1/13)
=79/13
2.=276*(2/7)÷(276/10)
=276*(2/7)*(10/276)
=(2/7)*10
=20/7
3.=9.25*9.9+0.925
=9.25*9.9+9.25*0.1
=9.25*(9.9+0.1)
=92.5
1.=54*(1/9)+(9/13)/(1/9)
=6+(1/13)
=79/13
2.=276*(2/7)÷(276/10)
=276*(2/7)*(10/276)
=(2/7)*10
=20/7
3.=9.25*9.9+0.925
=9.25*9.9+9.25*0.1
=9.25*(9.9+0.1)
=92.5