A:可知电源电压为6V
B:可知L1两端电压为2.6V
C:将电压表V2换成电流表,则L1亮,L2不亮
D:将电压表V1换成电流表,则L1与L2并联,电流表测干路上的电流
解方程:2x2﹣4x﹣1=0(配方法)
— Yes, I can play with lots of friends in it.
设f(x)=2 3 sin(π﹣x)sinx﹣(sinx﹣cosx)2.