Little careless miscalculated 17 * (M + 3 / 10) as 17 * m + 3 / 10. What is the difference between his calculation and the correct answer

Correct answer: 17 * (M + 3 / 10) = 17m + 51 / 10 = 17m + 5.1,
He calculated that 17 * m + 3 / 10 = 17m + 3,
The difference between his calculation and the correct answer is: 17m + 5.1 - (17m + 3) = 17m-17m + 5.1-3 = 2.1,

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