下午3时，石泰峰宣布大会开幕，全体起立，高唱中华人民共和国国歌。
If you wanted to find an exact match, you could try aideal = r · b; this makes the a / b fraction equal to r · b / b = r. That said, r · b might not be an integer (or even a rational number), so even without the added constraint, the approach is usually a bust.
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