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efectuați dând factor comun 1×2+2×3+3×4+4×5+5×6+6×7

Răspuns :

2x(1+3) + 4x(3+5) + 6x (5+7) = 2x4 + 4x8 + 6x12= 8+32+72= 112
1*2+2*3+3*4+4*5+5*6+6*7=
2*(1+3)+4*(3+5)+6*(5+7)=
2*4+4*8+6*12=
8+32+72=112