用简便方法计算 19.98×37-199.8×1.9+1998×0.82

问题描述:

用简便方法计算 19.98×37-199.8×1.9+1998×0.82

19.98×37-199.8×1.9+1998×0.82
=19.98× 37-19.98×19+19.98×82
=19.98×(37-19+82)
=19.98×100
=1998