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Evaluate $1,99 \times 10^{-26}+1,67 \times 10^{-27}-2,79 \times 10^{-25}$
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Step 1: Make all the exponents the same
To add or subtract numbers in scientific notation we must make all the exponents the same:
\begin{aligned} 1,99 \times 10^{-26} &=0,199 \times 10^{-25} \\ \text { and } 1,67 \times 10^{-27} &=0,0167 \times 10^{-25} \end{aligned}
Step 2: Carry out the addition and subtraction
Now that the exponents are the same we can simply add or subtract the $N$ part of each number:
$0,199+0,0167-2,79=-2,5743$
Step 3: Write the final answer
To get the final answer we put the common exponent back:
$-2,5743 \times 10^{-25}$
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