单项选择题





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单项选择题
If a is increased by 10% and b is decreased by 10%, the resulting numbers will be equal. What is the ratio of a to b
单项选择题
In the figure at the right, the legs of fight triangle ACB are diameters of the two semicircles. If AB = 4, what is the sum of the areas of the semicircles
(A) π
(B) 2π
(C) 4π
(D) 8π
(E) 16π
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