计算：)u8S+j-D/a7T)f
3（1/2）+4（7/12）×2（2/11）-1（5/24）÷2（5/12）='Q'\2b(u+T9_8i2u(I*`:|1z.G6K)n0a;V-e/s)u8S+j-D/a7T)f