搜题请搜索小程序“爱下问搜题”
问题 填空题
像
1
2
，
1
3
，
1
4
，
1
5
…这样，分子是1，分母是某一自然数（0和1除外）的分数称为单位分数，据史书记载，古埃及人只用单位分数，其他分数（
2
3
除外）都是用单位分数的和表示，例如：他们想表示
3
10
，他们不用“
3
10
”这个分数，而是用“
1
5
+
1
10
”来表示，如果现在要把
2
5
表示成三个单位分数的和，则
2
5
=
1
□
+
1
□
+
1
□
（□内填三个不同的数）
答案

2
5
=
2
1×5
=
2×(1+5)
1×5×(1+5)
=
2
1×5×6
+
2×5
1×5×6
=
1
15
+
1
3
=
1
15
+
1×(1+3)
1×3×(1+3)
=
1
15
+
1
3×4
+
3
3×4
=
1
15
+
1
12
+
1
4
；

因此

2
5
=
1
15
+
1
12
+
1
4
；

故答案为：15，12，4．

实验题

小明根据实验数据绘制了电阻R2随电阻R1变化的图像，如图所示。请你根据该图像和已有知识判断：当电阻R1＝52Ω时，电阻R2＝_______Ω。（1分）
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单项选择题

Honesty comes in many forms. First there’s self honesty. Is what people see the real article or do you appear through smoke and mirrors I find that if I try to be something I’m not, I feel unsure of myself and take out a part from my PBA (personal bank account). I love how singer Judy Garland put it, "Always be a first class version of yourself, instead of a second class version of somebody else. "
Then there’s honesty in our actions. Are you honest at school, with your parents, and with your boss If you’ve ever been dishonest, I think we all have, try being honest, and notice how whole it makes you feel. Remember, you can’t do wrong and feel right. This story by Jeff is agood example of that:
In my second year of study, there were three kids in my math class who didn’t do well. I was really good at it. I would charge them three dollars for each test that I helped them pass. I’d write on a little piece of paper all the right answers, and hand them off.
At first I felt like I was making money, kind of a nice job. I wasn’t thinking about how it could hurt all of us. After a while I realized I shouldn’t do that any more, because I wasn’t really helping them! They weren’t learning anything, and it would only get harder down the road. Cheating certainly wasn’t helping me.
It takes courage to be honest when people all around you who are getting away with cheating on tests, lying to their parents, and stealing at work. But, remember, every act of honesty is a deposit into your PBA and will build strength.

Which of the following can best explain Judy Garland’s words

A．Be your true self rather than follow others.
B．Don’t copy others or you can’t be the first class.
C．Make efforts to be the first instead of the second.
D．Don’t learn from others unless they’re excellent.
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