14.76﹣5.76﹣                              4÷8×2
64×                                    6×5﹣3×2
13×+4×10                              198÷198+
12.5×+3×1.25                           +++
（3.7×5﹣4.7×3.7）÷                  [0.3+（+□）×3]÷0.3=860
56×                                      18.75﹣（4.5﹣7.25）
3.6×31+3.14×64                           132÷131
3×+4×+5×+6×                      112×（24﹣4）÷2.4
（81.4+++）÷（++）                 41.2×8.1+11×9+53.7×1.9
++++++                       +++…+．