WAEC - Mathematics (1998 - No. 60)
Evaluate \(3.0\times 10^1 - 2.8\times 10^{-1}\)leaving the answer in standard form
\(2\times 10^{-1}\)
\(2\times 10^{2}\)
\(2.972 \times 10^{1}\)
\(2.972 \times 10^{2}\)
설명
\(3.0\times 10^1 - 2.8\times 10^{-1}\) = 30 - 0.28 = 29.72 = 2.972 x 10\(^1\)