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Q14: <span class="ql-formula" data-value="\left\{ \frac { 1 }
Q35: <span class="ql-formula" data-value="\begin{array} { l l }
Q43: Among a group of 80 investors, 19
Q62: <span class="ql-formula" data-value="H ( x ) =
Q119: <span class="ql-formula" data-value="\sum _ { k =
Q127: The number of mosquitoes <span
Q136: <span class="ql-formula" data-value="c = 4 ; \quad
Q140: <span class="ql-formula" data-value="x ^ { 2 }
Q227: <span class="ql-formula" data-value="f(x)=-2 x^{2}-20 x-53"><span class="katex"><span class="katex-mathml"><math
Q266: <span class="ql-formula" data-value="h ( x ) =