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最佳答案:I think the most meaningful social activity that I have ever done is the one tha
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最佳答案:We will pay a visit to the old people’s home this Sunday. We’ll have to meet at
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最佳答案:(1)参加这些活动所需人数为1+3×3+2×4=18人,每人参加的次数为186=3(次);(2)设这6名同学中只参加1次公益活动的是A,参加了三次公益活动的是B
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最佳答案:设需要45座x辆.则可据题意得45x+15=60(x-1)解得x=5,则人数为60×(5-1)=240人220÷45=44/9 300÷60=5 ∵44/9<5
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最佳答案:设x 小时后相遇4x0.5 + 4x =12xx=0.25