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в литрах:                ↓                                                  

                                                                                                  

                                                                                                                                                          (450 л +40 дм.куб. х 30)-15.000 см.куб.=                                

) (450л +40 куб.дм*30)-15000 куб.см=(450 л +40 л*30)- 15л=(450л+1200л)-15л=1650л - 15л=1635 л

(450л+1200дм.куб.)-15.000см куб.=450л+1200л-15л=1635л,(1дм.куб.=1л,1л=1000см куб.)