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已知a2-3a-1=0,则3(1+a)-a2= .
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教案备课库《期末数学模拟试卷3》真题及答案
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电路如图所示二极管为理想元件已知u2=100sin314tVRL=90Ω电流表的内阻视为零电压表的
100V,1A,45V
100V,1.1A,100V
100V,1A,90V
141V,1A,90V
图中已知I1=1AI2=2AI3=1A试求电源输出的总电流I
在图10-9所示电路中已知U=10VI1=-4AI2=1A电流I3为A
1
2
3
不能确定
电路如图所示二极管为理想元件已知u2=100sin314tVRL=90Ω电流表的内阻视为零电压表的
100V,1A,45V
100V,1.1A,100V
100V,1A,90V
141V,1A,90V
在下图所示电路中已知Us=10VI1=-4AI2=1A电流I3=
1A
2A
3A
4A
已知数列{an}中a1=3a2=6an+2=an+1-an则a2009=
6
-6
3
-3
以下正确的赋值语句是
A1,A2,A3=10
SET 10 TO A1,A2,A3
LOCAL 10 TO A1,3.2,A3
STORE 10 TO A1,A2,A3
在Excel中设A1单元格的值为23A2单元格的值为36若在A3单元格中输入A1-A2则A3单元格中
-13
13
######
A1-A2
电路如图所示二极管为理想元件已知u2=100sin314tVRL=90Ω设电流表的内阻视为零电压表的
100V,1A,45V
100V,1A,90V
100V,1.1A,100V
141V,1A,90V
有一条横截面积S.=1mm2的铜导线通过的电流I.=1A已知铜的密度ρ=8.9×103kg/m3铜的
在图中已知I1=4AI2=-2AI3=1AI4=-3A则I5=A
5A
10A
50A
-5A
已知数列{an}满足3an+1+an=0a2=-则{an}的前10项和等于
-6(1-3-10)
(1-310)
3(1-3-10)
3(1+3-10)
在下图所示电路中已知Us=10VI1=-4AI2=1A电流I3=
1A
2A
3A
4A
已知:A1=A3=15A2=750+0.4~0孔中尺寸=720+0.6~0 求:A1A2的上下偏差.
电路如图所示二极管为理想元件已知u2=100sin314tVRL=90Ω电流表的内阻视为零电压表的
100V,1A,45V
100V,1.1A,100V
100V,1A,90V
141V,1A,90V
在Excel中设A1单元格的值为23A2单元格的值为36若在A3单元格中输入Al—A2则A3单
-13
13
######
A1-A2
电路如图所示二极管为理想元件已知u2=100sIn314tVRL=90Ω设电流表的内阻视为零电压表
100V,1A,45V
100V,1A,90V
100V,1.1A,100V
141V,1A,90V
以下正确的赋值语句是
A1,A2,A3=10
SET 10 TO A1,A2,A3
LOCAL 10 TO A1,A2,A3
STORE 10 TO A1,A2,A3
电路如图所示二极管为理想元件已知RL=90Ω设电流表的内阻视为零电压表的内阻视为无穷大交流电压表V
100V,1A,45V
100V,1A,90V
100V,1A,100V
141V,1A,90V
并联交流电路如图7-23所示已知z1=-jXLz2=-jXcI=4AI2=1A电路呈感性I1等于
5A
3A
4.12A
3.87A
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