两根同样长的绳子第一根截去12米,第二根截去18米,第一根余下部分是第二根余下部分的1.5倍，原
\u6709\u4e24\u6839\u540c\u6837\u957f\u7684\u7ef3\u5b50\uff0c\u7b2c\u4e00\u6839\u622a\u53bb12\u7c73\uff0c\u7b2c\u4e8c\u6839\u63a5\u4e0a14\u7c73\uff0c\u8fd9\u65f6\u7b2c\u4e8c\u6839\u957f\u5ea6\u662f\u7b2c\u4e00\u6839\u957f\u5ea6\u76843\u500d\uff0c\u4e24\u6839\u7ef3\u5b50\u539f\u6765\u5404\uff0812+14\uff09x3\u00f7(3-1)=39\u7c73
39-14\uff1d25\u7c73
\u7b54 \u539f\u6765\u957f25\u7c73
\u5dee\u500d\u95ee\u9898\uff0c\u5dee/\uff08\u500d\u6570-1\uff09\uff0c\u5dee\u5c31\u662f12 \uff0b14\u6240\u4ee5\u7b97\u5f0f\u662f\uff0812 \uff0b14\uff09/\uff083-1\uff09=13\u7b2c\u4e00\u6839\u5269\u4f59\u7684\uff0c\u539f\u6765\u957f\u662f13\uff0b12=25
设：原来绳长x米。x-12=1.5(x-18)
x-12=1.5x-27
27-12=(1.5-1)x
0.5x=15
x=30
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