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Đồng Thị Cải
Giới thiệu về bản thân
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![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
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![](https://rs.olm.vn/images/medal_win_1.png)
![](https://rs.olm.vn/images/medal_cao_thu.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_win_1.png)
![](https://rs.olm.vn/images/medal_thong_thai.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
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![](https://rs.olm.vn/images/medal_dai_kien_tuong.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
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Vì điểm là trung điểm của đoạn thẳng .
Suy ra $AM=MB=\dfrac{AB}2=\dfrac 42=2 (cm).
Số học sinh giỏi là:
40.7/20=14(học sinh)
Số học sinh trung bình là:
40.1/8=5 (học sinh)
Số học sinh khá là:
14+5=19(học sinh)
Số học sinh yếu là:
40-(14+5+19) =2 (học sinh)
Vậy số hs giỏi là:14 hs
số hs khá là:5 hs
số hs trung bình là:19 hs
số hs yếu là: 2 hs
a.1/2 .4/3-20/3.4/5 b. 3/7+-6/19+4/7 + -13/19 c.3/5.8/9-7/9.3/5 +3/5.26/9
=4/6-80/15 =(3/7+4/7) +(-6/19+-13/19) =3/5.(8/9-7/9+26/9)
=2/3-16/3 =7/7+ -19/19 =3/5.27/9
=-14/3 =1+(-1) =71/45
= 0