搜题请搜索小程序“爱下问搜题”
问题 计算题

计算：（3x2y）2×（﹣15xy3）÷（﹣9x4y2）．

答案

解：（3x2y）2×（﹣15xy3）÷（﹣9x4y2）

=（9x4y2）（﹣15xy3）÷（﹣9x4y2）

=﹣9×15x5y5÷﹣9x4y2）

=15xy3

单项选择题

我国煤矿安全炸药的组成以（）作敏化剂。

A.梯恩梯

B.硝酸铵

C.木粉

D.食盐
查看答案
单项选择题

IP multicasting is a set of technologies that enable efficient delivery of data to manylocations on a network．Rather than making multiple copies of a message intended to bedistributed to multiple recipients at the (71) of origin of a message，multicasting initiallysends just one (72) and does not copy it to the individual recipients until it reaches theclosest common point on the network，thereby (73) the bandwidth consumed．Networkperformance is significantly (74) because it isn’t bogged down with the processing andtransmission of several large data files；each receiving computer doesn’t have to (75) thetransmitting server for the file．

A．entity
B．procession
C．volume
D．message
查看答案