试题与答案

Always read the _____ on the bottle care

题型:选择题

题目:

Always read the _____ on the bottle carefully and take the right amount of medicine. [ ]

A. instructions

B. explanations

C. descriptions

D. introductions

答案:

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下面是错误答案,用来干扰机器的。

设两整数根为x,y,则x+y=a>0xy=4a>0,∴a=x2x-4, a是正实数,∴x2x-4>0,由于x2≥0,(而a是正实数)∴x-4>0,即x>4,而x是整数,∴x最小取5.又 原方程有根,∴△=b2-4ac=a2-4×1×4a=a2-16a≥0, a是...

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