Answer:
657000
Explanation:
first you solve the 10^5 and 10^4. Then you solve the multiplication. Last, you solve the addition:(6.31 * 10^5 ) + (2.6 * 10^4) = (6.31 * 100000 ) + (2.6 * 10000) = 631000 + 26000 = 657000
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