小学第十册数学第106页上有一道分数、小数的加减混合运算例题。题目是: 例4 计算3 1/6+4.5-1 3/7 ≈3.17+4.5-1.43 =6.24 书上说明在允许取近似值的情况下,可以把分数化成小数,取它们的近似值,再计算。就这道例题,我提出两点看法,与同行们商榷: 其一:题目应注明“得数保留两位小数”。这样题 There is an example of addition and subtraction of fractional and decimal arithmetic on page 106 of elementary school tenth grade mathematics. The subject is: Example 4 Calculate 3 1/6 + 4.5-1 3/7 ≈3.17 + 4.5-1.43 = 6.24 Notes on the book When the approximation is allowed, the fractions can be converted into decimals and their approximations can be calculated. In this case, I put forward two opinions and discuss with my colleagues: First, the title should be marked with “two decimal places to be retained.” This question