设（1+2x)10展开后为1+a1x+a2x2+...+a10x10,a1+a2=( )_刷题宝

题干

设（1+2x)¹⁰展开后为1+a₁x+a₂x²+...+a₁₀x¹⁰,a₁+a₂=( )

A：20

B：200

C：55

D：180

上一题下一题 0.0难度选择题更新时间:2019-05-05 11:47:54

答案(点此获取答案解析）

B

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First name: Emily State or province: Illinois Country: USA
Stay low, close to the ground and make your way outside. Then call the local emergency(急救)number from your neighbor's house. This is the most important thing to do. Then wait for the firefighters(消防队员).

First name: Vanessa State or province: Texas Country: USA
If there was a fire and I was in the shower, the first thing I would do would be to make all my clothes really wet and put them on. Then I would break the window with something and get out. If I couldn't do that, I would lie down and leave the water running.

First name: Kystina State or province: Illinois Country: USA
I've never actually been in a fire, but I know what to do. Sometimes at school we have fire drills so that we know what to do if there is a real fire.

First name: Henry State or province: Alaska Country: USA
I would do what they did in the Great Fire, even though it did not happen in the real life. It was a very exciting story.

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