原式:
12.5×1.2×80×0.07
=(12.5×80)×(1.2×0.07)
=1000×0.084
=84
2.05×(0.8-0.36)
=2.05×0.44
=2.05×0.4+2.05×0.04
=0.82+0.082
=0.902