4有3分之2除以7 减去9分之1加（4除以1又3分之1减2又6分之1）加5又2分之1减3又8分之一

(4+2/3)÷7 - 1/9 + [4÷(1+1/3) -(2+1/6)] + (5+1/2) - (3+1/8)= 14/3÷7 - 1/9 + [4÷4/3 -(2+1/6)] + (5+1/2) - (3+1/8)= 2/3- 1/9 + [3 -(2+1/6)] + (5+1/2) - (3+1/8)= 2/3- 1/9 + 3 -(2+1/6) + (5+1/2) - (3+1...