A.相离 | B.外切 | C.内切 | D.相交 |
A.(x-5)2+(y+7)2="25" | B.(x-5)2+(y+7)2=17或(x-5)2+(y+7)2=15 |
C.(x-5)2+(y+7)2="9" | D.(x-5)2+(y+7)2=25或(x-5)2+(y+7)2=9 |
A.r<+1 | B.r>+1 | C.|r-|<1 | D.|r-|≤1 |
A.(a-b)2=c2 | B.(a-b)2=2c2 | C.(a+b)2=c2 | D.(a+b)2=2c2 |
A.4条 | B.3条 | C.2条 | D.1条 |
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