甲数比乙数多百分之25，乙数是甲数的多少
\u7532\u6570\u662f25\uff0c\u4e59\u6570\u662f30\uff0c\u7532\u6570\u6bd4\u4e59\u6570\u591a\u767e\u5206\u4e4b\u51e0\uff1f\uff0830-25\uff09/30*100%=16.67%
\u7532\u6570\u6bd4\u4e59\u6570\u5c1116.67%
\u89e3\uff1a
\u56e0\u4e3a\u7532\u6570\u6bd4\u4e59\u6570\u591a\u767e\u5206\u4e4b25\uff0c\u6240\u4ee5\u4e59\u6570*\uff081+25%\uff09=\u7532\u6570\uff0c\u6240\u4ee5\u4e59\u6570=0.8*\u7532\u6570=\u7532\u6570\uff081-20%\uff09\uff0c\u6240\u4ee5\u4e59\u6570\u6bd4\u7532\u6570\u5c1120%\u3002
1÷（1+25%）
=1÷1.25
=4/5
乙数是甲数的5分之4
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