计算:6K.k/L6\2u)J-S0g8Q4J)t2Q'v(`
(1/2)+(1/3)-(1/4)÷(5/6)-(7/12)×(3/7)=)q([+P8O5U6K.k/L6\2u)J-S0g8Q4J)t2Q'v(`