It's time ________lunch. Let's stop working.
7982+7983=____
50072-3987=____
若|a+2|+(b﹣1)2=0,那么代数式(a+b)2017的值是( )
在Z轴上求一点M,使点M到点A(1,0,2)与点B(1,﹣3,1)的距离相等.