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 s 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.
答案是D
我覺的是E(天差地遠的)
麻煩幫忙解答一下 頭都快想破掉了
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