搜题请搜索小程序“爱下问搜题”
问题 填空题

A×48+A×52=______×（______+______）．

125×（73×8）=73×（______×______）

答案

（1）A×48+A×52=A×（48+52），

125×（73×8）=73×（125×8）．

故答案为：A，48，52，125，8．

单项选择题

The first men to study the nature of electricity could not imagine that their experiments, carried on because of mere intellectual curiosity, would eventually lead to modern electrical technology, without which we can scarcely () contemporary life.

A. get hold of

B. conceive of

C. get the better of

D. take advantage of
查看答案
填空题

一条光线垂直于平面镜入射，则此时入射角为_________，若保持镜面不动，入射光线沿顺时针转过25°角，则反射光线沿_________时针方向转过_________，入射光线与反射光线的夹角为_________。

查看答案