71.7×4.06-59.4×2.83=7.17×40.6-59.4×2.83=（10-2.83)×40.6-59.4×2.83 =406-2.83×40.6-59.4×2.83 =406-(40.6+59.4)×2.83 =406-283=12336.8×8.4+14×0.17+38.5×1.6=36.8×(10-1.6)+14×0.17+38.5×1.6=368...