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8×10^5+7×10^4 +2×10^2+6×10+5


Răspuns :

8×10^5+7×10^4 +2×10^2+6×10+5 =

= 10^4 (8×10 + 7) + 10 (2×10 + 6) + 5 =

= 10^4 × 87 + 10 × 26 + 5 =

= 10 000 × 87 + 260 + 5 =

= 870 000 + 265 =

= 870 265