德望學校 – S1數學 1A Chapter 1 Basic Computation – CQ (16-21)

試卷答案:

1. [16-17 Mid-year Exam, #1]
   1 a) 2
   b) 14
   c) 5
   d) 0
   
   
2. [18-19 S. Test, #1]
   a) 36 = 2² x 3²
   48 = 2⁴ x 3
   L.C.M. = 2⁴ x 3² = 144
   b) The required sum
   = 144 + 288 + 432
   = 864
   
   
3. [18-19 Mid-term Exam, #1]
   \(\begin{align}
   a) & (1+4) \div (1+2+3+4+5) \\
   & = \dfrac{1}{3} \\
   b) & 5 +10 + 15 + 20 \\
   & = 50
   \end{align}\)
   
   
4. [18-19 Mid-term Exam, #1]
   \(\begin{align}
   1. (a) &4\dfrac{2}{5} = \dfrac{22}{5} \\
   1. (b) &4\dfrac{2}{5} < \dfrac{31}{7} \\
   1. (c) &4.4 + 1.5 \times 4\dfrac{2}{5} \\
   & = 4.4 + \dfrac{15}{10} + \dfrac{22}{5} \\
   & = 11
   \end{align}\)
   
   
5. [20-21 Mid-Year, #2]
   16 = 2⁴
   24 = 2³ x 3
   30 = 2 x 3 x 5
   L.C.M = 2⁴ x 3 x 5 = 240 
   
   
6. [20-21 Final Exam, #1]
   (a) -4
   (b) 5

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