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calculati scotand factor comun : b) 3 ori 5+3x 1 supra 4+3 ori 17 supra 16
c) 2 supra 5 ori 7 +3ori 7 -7x12supra 5


Răspuns :

(3x5+3x1)/4+ 3x17/16=3(5+1)/4+3x17/16Dam factor comun pe 3/4 si rezulta
3/4 (6+17/4)
c) 2/5x7+3x7-7x12/5 Dam factor comun 7

7 (2/5+3-12/5)=7(3-10/5)=7(3-2)=7*1=7