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grupati convenabil termeni 400+3750+1600+250

Răspuns :

400+3750+1600+250=400+1600+3750+250=400(1+4)+250(15+1)=400*5+250*16
=2000+4000=6000
400  + 3750    + 1600 + 250     = 4150 + 1850 = 6000.