两曲线x﹣y=0,y=x2﹣2x所围成的图形的面积是____
读下图,完成下列问题。
满足方程组4x+my=23x+y=12的一对未知数x、y的值互为相反数,则m值为( )
The microphone enabled them to keep in touch,________ it made it convenient for them to contact each other.