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Efectuează 20×300 , 30×70, 500×10,30×300,90×100, 200×10,20×400,20×20,60×100,10×800.

Răspuns :

20x300=6000
30x70=2100
500x10=5000
30x300=9000
90x100=9000
200x10=2000
20x400=8000
20x20=400
60x100=6000
10x800=8000
20×300=6000
 30×70=2100
500×10=5000
30×300=9000
90×100=9000
200×10=2000
20×400=8000
20×20=400
60×100=6000
10×800=8000