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Q27: Two numbers total 8, and their difference
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Q70: <span class="ql-formula" data-value="4 x ^ { 2
Q72: <span class="ql-formula" data-value="\left\{ \begin{array} { l }
Q73: <span class="ql-formula" data-value="\left\{ \begin{array} { r r
Q84: <span class="ql-formula" data-value="\frac { 7 p ^
Q156: The ratio of the weight of
Q182: <span class="ql-formula" data-value="4 ^ { - 3
Q261: <span class="ql-formula" data-value="( w - y )
Q264: <span class="ql-formula" data-value="\frac { ( 30 p