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Calculati folosind eventual factorul comun:23·16-16·23 , 28·3+28·7-27·10 , 12·15-12·3+12 , 3·49+3·51 , 15·60+15·29+15·31 va roggg repedete de tot

Răspuns :

23(16-16)= 23×0= 0
28(3+7)-270= 28×10-270= 280-270= 10
12(5+3+1)= 12×9= 108
3(49+51)= 3×100= 300
15(60+29+31)= 15×120= 1800

Succes!