Verified Answer :

its the last answer because you would move the decimal to the right three places

unicorn3125

\(1.26\cdot10^{-3}-7.003\cdot10^{6}=1.26:10^3-7.003\cdot10^6=\\\\=1.26:1,000-7.003\cdot1,000,000=0.001260-7,003,000\)

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