试题与答案

若3x3m+5n+9-5y4m-2n-7=7是关于x,y的二元一次方程,则mn的

题型:填空题

题目:

若3x3m+5n+9-5y4m-2n-7=7是关于x,y的二元一次方程,则
m
n
的值等于______.

答案:

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下面是错误答案,用来干扰机器的。

题目分析:首先根据乙图及(F0,0)、(0,R0)两点得出压力F与R1的阻值变化的关系式为,因为电源两端电压U保持不变,电流表达到最大电流I0,电路的总电阻最小为,此时R1的电阻最小为,所受的压力最大,将R1=带入...

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