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Efectuati folosind factorul comun. a)7*13-7*3 b)2008*2009-2006*2009-2*2008 c)96*94-96*92-2*93 d)(5+17)*(31+27)+(5+17)*(19+23)

Răspuns :

Capsunica35
a)7*(13-3)=7*10=70
2009(2008-2006)-2*2008=2009*2-2*2008=2*(2009-2008)=2*1=2
96(94-92)-2*93=96*2-2*93=2(96-93)=2*3=6
(5+17)[(31+27)+(19+23)]=22*[58+42]=22*100=2200

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