144.DS:a、b为正整数,然后题干能够推算出来一个y=ax^2+b的方程。然后问与X轴有没有交点。条件1给出了a=2,条件2给出了b=3。画抛物线可以一目了然。B
because both a and b belong to positive integers, both 1) and 2) are not needed.
so what's the OA?
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