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Scoateti factor comun 15 x 6+15 x 13+15=
13x4+16x7+16x6


Răspuns :

15 * 6+15 * 13+15= 15*(6+13+1)=15*20=300


13* 4+16 * 7+16* 6= 13*4+16*(7+6)=13*4+16*13= 13*(4+16)= 13*20=260