If the ratio of the degree of exterior angle of ∠A,∠B and ∠Cthat are in the triangle ABC is 5:4:3,then the ratio of the degree of ∠A,∠B and ∠C is ( )A、5:4:3 B、3:4:5 C、1:2:3 D3:2:1
下列计算错误的是
某班实行每周量化考核制,学期末对考核成绩进行统计,结果显示甲、乙两组的平均成绩相同,方差分别是S2甲=36,S2乙=30,则两组成绩的稳定性:
如图是一个长方体包装盒,则它的平面展开图是
不等式组的解集在数轴上表示为
计算的结果是