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the cost of a square slab is proportional to its thickness and also proportional to the square of its length.what is the cost of a square slab that is 3 meters long and 0.1 meter thick?
(1)the cost of a square slab that is 2 meters long and 0.2 meter thick is 160 more than the cost of a square slab that is 2 meters long and 0.1 meter thick
(2)the cost of a square slab that is 3 meters long and 0.1 meter thick is 200 more than the cost of a square slab that is 2 meters long and 0.1 meter thick
引用： RayeRach 我的问题是这道题该怎样列式呢？
是c=k*T*L^2(k是比例）然后将（1）（2）的数代入
还是c=k1*T
c=k2*L^2(k1 k2是不同比例）
我怎麽看着道题都觉得题的字面意思是说第二种方程，可是看样子第一种是正确情况，到底该怎麽读这道题才对？ |
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发表于 2011-12-27 04:16:47
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