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If a microscope has an ocular lens with a magnific...
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If a microscope has an ocular lens with a magnification of 10 and an objective lens with a magnification of 40, what is the overall magnification?
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[问答题] Express 0.0009013 in scientific notation.
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[问答题] Order the following three numbers from least to greatest: 1) 42%; 2) 0.402; 3) 2/5.
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