如果甲数比乙数多25%，那么乙数比甲数少多少

\u7532\u6570\u6bd4\u4e59\u6570\u591a25%\u5219\u4e59\u6570\u6bd4\u7532\u6570\u5c11\u591a\u5c11\uff1f\uff1f\uff1f\uff1f\uff1f\u8981\u8fc7\u7a0b

\u8bbe\u4e59\u6570\u4e3a\u5355\u4f4d\u201c1\u201d
\u90a3\u4e48\u7532\u6570\u5c31\u662f1*\uff081+25%\uff09=1.25

\uff081.25-1\uff09\u00f71.25
=0.25\u00f71.25
=1/5
=0.2
=20%

\u90a3\u4e48\u4e59\u6570\u662f100\u4efd\uff0c\u7532\u6570\u662f100+20=120\u4efd
\u3010120-100\u3011/120=1/6

设乙数为X,则甲数为X+25%X=1.25X,
1.25X-X=0.25X,
所以0.25X/(1.25X)=0.2=20%,
即乙数比甲数少20%.

25%÷(1+25%)
=25%÷125%
=20%
答：乙数比甲数少20%。

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