计算：6|:b1_'y8m/f)R,|/G7H)a:W3z5T+s*a1\3T.G
（2（7/8）+1（1/4）-（1/2）÷3（5/8）×（5/9）=0p1a3h3O*f'h(c,@/c']6|:b1_'y8m/f)R,|/G7H)a:W3z5T+s*a1\3T.G