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如圖,因為圓周被直線3x+4y+15=0分成1:2兩部分,所以∠AOB=120°.而圓心到直線3x+4y+15=0的距離d=1532+42=3,在△AOB中,可求得OA=6.所以所求圓的方程為x2+y2=36.故答案為:x2+y2=36
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