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3×10la puterea3+5×10la puterea2 +7

Răspuns :

3×10^3 + 5*10^2 +7 = 10^2(3×10 + 5) = 100×35= 3500 + 7 = 3507
3×10^3+5×10^2+7 = 3× 1000 + 5 × 100 + 7= 3000 + 500 + 7 = 3500 + 7 = 3507