=(5分之77÷1.1+4分之15×15分之8)÷2.63+1.37-(1.68+0.32)
=(5分之66+2)÷2.63+1.37-2
=(5分之66+2)÷2.63+1.37-2
=15.2÷2.63-（2-1.37)
=263分之1520-0.63
=26300分之135431