1.on average, the rainfall is 3/2 inches in july, if this region recieve 1/15 inch of rainfall in last july, what is the average rainfall in last july
答案:0.01% 0.4% 10% 20% 还有个忘了
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0.04%,我考到了,忘不了这个答案
能说说思路吗,谢谢
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