如图所示，电阻R1和R2串联在电压为U的电路上。为了计算通过R1的电流大小，某同学写出了以下公式，其中错误的是（）

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如图所示，电阻R₁和R₂串联在电压为U的电路上。为了计算通过R₁的电流大小，某同学写出了以下公式，其中错误的是（）

A：

B：

C：

D：

上一题下一题 0.0难度选择题更新时间:2018-11-14 09:24:55

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C

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Nick is my good friend from England. Now let me tell you something(一些事情)about him.

Nick is a student and he is thirteen years old.His family are in Beijing now.His father,Mr Brown,is a manager in a hotel. His mother,Mrs Brown, is an English teachers at his school. Nick has a sister. Her name is Kate. Now they study in the same school.Look!This is a picture of their school. It is very big. There is a tall building with 23 classrooms in the middle of the school.The library is behind the tall building. The sports hall is next to the library. A playground is in front of the sports hall. It's big too. Nick and Kate like their school in Beijing very much.

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8＋x=10＋3	____