33.7*121+337*42.2+337*54.3
=337x12.1+337*42.2+337*54.3
=337x（12.1+42.2+54.3）
=337x108.6
=36598.2
33.7*121+337*42.2+337*54.3的简便方法
33.7*121+337*42.2+337*54.3
=337x12.1+337*42.2+337*54.3
=337x（12.1+42.2+54.3）
=337x108.6
=36598.2