1.

When \[5\times {{10}^{-3}}-2000\times {{10}^{-6}}\] is expressed in standard form, we will get

A.  \[3\times {{10}^{-2}}\]     
B.         \[3\times {{10}^{-3}}\]      
C.  \[3\times {{10}^{3}}\]        
D.         \[3\times {{10}^{2}}\]        
Answer» C.  \[3\times {{10}^{3}}\]        


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