ijСѧΪÿ༶䱸һֿԼȵˮˮĹǣˮͨԴԶʼȣÿˮ10棬ȵ100棬ˮԶֹͣȣˮ¿ʼ-ѧ
ijСѧΪÿ༶䱸һֿԼȵˮˮĹǣˮͨԴԶʼȣÿˮ10棬ȵ100棬ˮԶֹͣȣˮ¿ʼ½ˮy棩ͨʱxminɷϵֱˮ½£ˮٴԶȣظ̣ijˮºΪ20棬ͨԴˮºʱĹϵͼʾش⣺ 1ֱ0x88xaʱyx֮Ĺϵʽ 2ͼaֵ 3±ǸСѧϢʱ䣬ͬѧϣһ¿820ʱܺȵ40Ŀˮ֪һ¿ǰ˽ˮֱдίԱӦʲôʱʱνͨˮԴϿʱͨˮԴ
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10x8ʱy=k1x+b 0208100y=k1x+b k1=10b=20 ൱0x8ʱy=10x+20 8xaʱy=
8100y=
k2=800 ൱8xaʱy=
൱0x8ʱy=10x+20 8xaʱy=
2y=20y=
a=40 3Ҫȵ40ˮ 10x+2040 0x2
20x40 Ϊ40Ϊһѭ 820Ҫȵ40ˮ Ҫ820-40+20=720 ڣ820-40ӣ-2=738745ˮ 720738745ʱˮ |
רȨ⡰ijСѧΪÿ༶䱸һֿԼȵˮˮĹ..Ҫ һκĽʽһκӦ ȿ⡣Щġ£
һκĽʽһκӦ
ƣһκĽʽһκӦ
- ϵһκĽʽ
ʽٸȷʽеδ֪ϵӶõĽʽķ
һκӦã
ӦһκӦ⣬һдʽ⣬跨⡣
1ͼģעʾʵ弰λ
2עԱȡֵΧ ôϵһκʽĸ裺
һ裩һʽһκͨʽ
ڶʽó̻顣
ͨз̻ϵkbֵ
IJддúĽʽ
һκӦ漰⣺
һֶκ
ֶκڲͬвͬӦʽĺҪرעԱȡֵΧĻ֣ҪѧҪ
ʵʡĶ
жʱԷЩĹϵѡȡһΪԱȻѰ
Էӳʵĺ
1һκ⣺ٽģ͵ķڷֶκ˼Ӧá
2Dz÷ֶκĹؼ
еӦã
1.ʱtһsٶvһκs=vt
2.ˮسˮٶfһˮˮgdzˮʱtһκˮԭˮSg=S-ft
3.ԭbδʱijȣһʱɹijyxһκy=kx+bkΪһκӦóùʽ
1.ͼkֵy1-y2)/(x1-x2)
2.xƽ߶εе㣺(x1+x2)/2
3.yƽ߶εе㣺(y1+y2)/2
4.߶εij[(x1-x2)2+(y1-y2)2 ]
5.һκʽͼ꣺ʽ
һκ y1=k1x+b1; y2=k2x+b2 y1=y2 k1x+b1=k2x+b2 õx=x0ֵy1=k1x+b1 ; y2=k2x+b2 ʽһʽ õy=y0 (x0,y0)Ϊ y1=k1x+b1 y2=k2x+b2
6.2߶εе꣺[x1+x2/2y1+y2/2]
7.2ߵһκʽx-x1/(x1-x2)=(y-y1)/(y1-y2) (ĸΪ0Ϊ0)
x,yΪ + +ʱõڵһ
x,yΪ - +ʱõڵڶ
x,yΪ - -ʱõڵ
x,yΪ + -ʱõڵ
8.ֱy1=k1x+b1//y2=k2x+b2k1=k2b1b2
9.ֱy1=k1x+b1y2=k2x+b2k1k2=-1
10.
y=kx-n+bֱƽnλ
y=kx+n+bֱƽnλ
y=kx+b+nƽnλ
y=kx+b-nƽnλ
ھҼxϼ¼b
11.ֱy=kx+bxĽ㣺(-b/k0) yĽ㣺(0b)
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