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Q2: <span class="ql-formula" data-value="\sum _ { k =
Q4: <span class="ql-formula" data-value="4 x ^ { 2
Q27: <span class="ql-formula" data-value="\left\{ \begin{aligned}2 x - y
Q31: <span class="ql-formula" data-value="\begin{array} { c } x
Q49: In a survey about the number
Q79: A town has a population of 20,000
Q90: <span class="ql-formula" data-value="\begin{array} { l } \left\{
Q111: <span class="ql-formula" data-value="P _ { 1 }
Q155: (1, -3), (7, -1), (13, -8)<br>A) Yes<br>B)
Q297: <span class="ql-formula" data-value="f(x)=5 \sqrt{x}"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>f</mi><mo