填空题．已知圆O1与圆O2内切，O1O2＝5cm，圆O1的半径为7cm，则圆O2的半径为____．
填空题
．已知圆O1与圆O2内切，O1O2＝5cm，圆O1的半径为7cm，则圆O2的半径为____．
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