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a fost răspuns

Grupeaza factorii pentru a calcula rapid. 4*39*25= ;2*50*16*2= ;15*50*4*2= ;20*43*5= ;150*7*2*5= ;137*15*2= .

Răspuns :

4*39*25= 39*4*25=39*100=3900
2*50*16*2=50*2*16*2=100*32=3200
15*50*4*2=15*4*50*2=60*100=6000
20*43*5= 20*5*43=100*43=4300
150*7*2*5= 150*7*10=150*70=10500
137*15*2=137*30=4110

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