301-78=____ 500-214=____
一电子钟放置在甲、乙、丙三个平面镜前的位置及示数如图,那通过三个平面镜看到电子钟的示数分别是( )
Mr. Green is very happy because he is satisfied with his students' work today.
在﹣6,﹣3,﹣2,1,6五个数中,任意取两个数相乘,能够得到的最大的乘积是( )