“二年级一班”中的“一”读()。
A.yī
B.yí
C.yǐ
D.yì
A.yī
B.yí
C.yǐ
D.yì
A、import queue as que import math x=[] y=[] def koch(ax,ay,bx,by,c): dist=(bx-ax)*(bx-ax)+(by-ay)*(by-ay) if(dist<=c): x.append(ax) x.append(bx) y.append(ay) y.append(by) else: cx="ax+(bx-ax)/3" cy="ay+(by-ay)/3" ex="bx-(bx-ax)/3" ey="by-(by-ay)/3" l="math.sqrt(math.pow(ex-cx,2)+pow(ey-cy,2))" alpha="math.atan((ey-cy)/(ex-cx))" if (alpha>=0 and (ex-cx)<0) or and alpha="alpha+math.pi" dy="cy+math.sin(alpha+math.pi/3)*l" dx="cx+math.cos(alpha+math.pi/3)*l" koch(ax,ay,bx,by,c) koch(bx,by,cx,cy,c) koch(cx,cy,dx,dy,c) koch(dx,dy,ex,ey,c)> B、import queue as que import math x=[] y=[] def koch(ax,ay,bx,by,c): dist=(bx-ax)*(bx-ax)+(by-ay)*(by-ay) if(dist<=c*c): x.append(ax) x.append(bx) y.append(ay) y.append(by) else: cx="ax+(bx-ax)/3" cy="ay+(by-ay)/3" ex="bx-(bx-ax)/3" ey="by-(by-ay)/3" l="math.sqrt(d/3)" alpha="math.atan((ey-cy)/(ex-cx))" if (alpha>=0 and (ex-cx)<0) or and alpha="alpha+math.pi" dy="cy+math.sin(alpha+math.pi/3)*l" dx="cx+math.cos(alpha+math.pi/3)*l" koch(ax,ay,cx,cy,c) koch(cx,cy,dx,dy,c) koch(cx,cy,ex,ey,c) koch(ex,ey,dx,dy,c)> C、import queue as que import math import matplotlib.pyplot as plt x=[] y=[] def koch(ax,ay,bx,by,c): dist=(bx-ax)*(bx-ax)+(by-ay)*(by-ay) if(dist<=c*c): x.append(ax) x.append(bx) y.append(ay) y.append(by) else: cx="ax+(bx-ax)/3" cy="ay+(by-ay)/3" ex="bx-(bx-ax)/3" ey="by-(by-ay)/3" l="math.sqrt(math.pow(ex-cx,2)+pow(ey-cy,2))" alpha="math.atan((ey-cy)/(ex-cx))" if (alpha>=0 and (ex-cx)<0) or and alpha="alpha+math.pi" dy="cy+math.sin(alpha+math.pi/3)*l" dx="cx+math.cos(alpha+math.pi/3)*l" koch(ax,ay,cx,cy,c) koch(cx,cy,dx,dy,c) koch(dx,dy,ex,ey,c) koch(ex,ey,bx,by,c)> D、import queue as que import math x=[] y=[] def koch(ax,ay,bx,by,c): dist=(bx-ax)*(bx-ax)+(by-ay)*(by-ay) if(dist<=c*c): x.append(ax) x.append(bx) y.append(ay) y.append(by) else: cx="ax+(bx-ax)/3" cy="ay+(by-ay)/3" ex="bx-(bx-ax)/3" ey="by-(by-ay)/3" l="math.sqrt(d/3)" alpha="math.atan((ey-cy)/(ex-cx))" if (alpha>=0 and (ex-cx)<0) or and alpha="alpha+math.pi" dy="cy+math.sin(alpha+math.pi/3)*l" dx="cx+math.cos(alpha+math.pi/3)*l" koch(ax,ay,cx,cy,c) koch(ex,ey,dx,dy,c) koch(cx,cy,ex,ey,c) koch(dx,dy,bx,by,c)>
A、import queue as que import math x=[] y=[] def koch(ax,ay,bx,by,c): dist=(bx-ax)*(bx-ax)+(by-ay)*(by-ay) if(dist<=c): x.append(ax) x.append(bx) y.append(ay) y.append(by) else: cx="ax+(bx-ax)/3" cy="ay+(by-ay)/3" ex="bx-(bx-ax)/3" ey="by-(by-ay)/3" l="math.sqrt(math.pow(ex-cx,2)+pow(ey-cy,2))" alpha="math.atan((ey-cy)/(ex-cx))" if (alpha>=0 and (ex-cx)<0) or and alpha="alpha+math.pi" dy="cy+math.sin(alpha+math.pi/3)*l" dx="cx+math.cos(alpha+math.pi/3)*l" koch(ax,ay,bx,by,c) koch(bx,by,cx,cy,c) koch(cx,cy,dx,dy,c)> B、import queue as que import math x=[] y=[] def koch(ax,ay,bx,by,c): dist=(bx-ax)*(bx-ax)+(by-ay)*(by-ay) if(dist<=c*c): x.append(ax) x.append(bx) y.append(ay) y.append(by) else: cx="ax+(bx-ax)/3" cy="ay+(by-ay)/3" ex="bx-(bx-ax)/3" ey="by-(by-ay)/3" l="math.sqrt(d/3)" alpha="math.atan((ey-cy)/(ex-cx))" if (alpha>=0 and (ex-cx)<0) or and alpha="alpha+math.pi" dy="cy+math.sin(alpha+math.pi/3)*l" dx="cx+math.cos(alpha+math.pi/3)*l" koch(ax,ay,cx,cy,c) koch(cx,cy,dx,dy,c) koch(cx,cy,ex,ey,c)> C、import queue as que import math import matplotlib.pyplot as plt x=[] y=[] def koch(ax,ay,bx,by,c): dist=(bx-ax)*(bx-ax)+(by-ay)*(by-ay) if(dist<=c*c): x.append(ax) x.append(bx) y.append(ay) y.append(by) else: cx="ax+(bx-ax)/3" cy="ay+(by-ay)/3" ex="bx-(bx-ax)/3" ey="by-(by-ay)/3" l="math.sqrt(math.pow(ex-cx,2)+pow(ey-cy,2))" alpha="math.atan((ey-cy)/(ex-cx))" if (alpha>=0 and (ex-cx)<0) or and alpha="alpha+math.pi" dy="cy+math.sin(alpha+math.pi/3)*l" dx="cx+math.cos(alpha+math.pi/3)*l" koch(ax,ay,cx,cy,c) koch(cx,cy,dx,dy,c) koch(dx,dy,ex,ey,c)> D、import queue as que import math x=[] y=[] def koch(ax,ay,bx,by,c): dist=(bx-ax)*(bx-ax)+(by-ay)*(by-ay) if(dist<=c*c): x.append(ax) x.append(bx) y.append(ay) y.append(by) else: cx="ax+(bx-ax)/3" cy="ay+(by-ay)/3" ex="bx-(bx-ax)/3" ey="by-(by-ay)/3" l="math.sqrt(d/3)" alpha="math.atan((ey-cy)/(ex-cx))" if (alpha>=0 and (ex-cx)<0) or and alpha="alpha+math.pi" dy="cy+math.sin(alpha+math.pi/3)*l" dx="cx+math.cos(alpha+math.pi/3)*l" koch(ax,ay,cx,cy,c) koch(ex,ey,dx,dy,c) koch(cx,cy,ex,ey,c)>
有如下一段程序: SET TALK OFF AY="Hello World!" BY="X" CY=ASC(BY)+1 DY=30 EY=CHR(DY*2+5)+CHR(CY) EY=&EY ?"&EY." SET TALK ON RETURN 执行该程序后,屏幕显示的结果为______。
A.AY
B.BY
C.Hello world!
D.程序出错
上已知a=(ax,ay,ax),b=(bx,by,bz),c=(cx,cy,cz),
试利用行列式的性质证明
(a×b)·c=(b×c)·a=(c×a)·b,
A. 1+x2=cy
B. (1+x2)(3+2y)=c
C.
D. (1+x2)2(3+2y)=c
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