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0=6+ + a2 + x91 - + zx pue 6= zk + xx |
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Answer» x^2 + y^2=9; c1=0(0,0), r1=3; x^2+y^2-16x+2y+49=0=( x-8)^2+(y+1)^2= c2=(8, -1), r2=4; c1c2=V65> r1+r2; p=(-8a, a), q=(8b, -b), b>0, c1=c1c2x r2/r1=V65x3/(4-3)=3V65=a=3, p(-24, 3); pp1 perpencular p1c1=(y1-3)/( x1+24)×y1/ x1=-1=x1^2+ y^2+24x1-3y1=0; 8x1-y11+3 (or)y1=8×1+3=65x1^2+48x1=0, p1=(0,3) p2=(-48/65, -189/65), t1:y=3, t2=16x+63y=195 |
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