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地板

楼主 |
发表于 2010-9-20 20:40:16
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对了 $10,000 is deposited in a certain account that pays r percent annual interest compounded annually, the amount D(t), in dollars, that the deposit will grow to in t years is given by D(t) = 10,000 {1+(r/100)}t. What amount will the deposit grow to in 3 years? (1) D(t) = 11,000 (2) r =10 A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient. B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient. C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient. D. EACH statement ALONE is sufficient. E. Statements (1) and (2) TOGETHER are NOT sufficient.
这个(1) 条件 怎么可以充分呢? 10000= 10,000 {1+(r/100)}t {1+(r/100)}t =11/10 这里t=1 r=10 ; t=2 r=根号(11/10)-1 应该有很多解阿? 我这样做有什么问题么? |
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