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“已知方程A,试问是否存在实数B,使A具有某种性质,若存在,试求B;若不存在,试说明其理由.”这类题是近年来中考试题中经常出
“If you know equation A, ask if there is a real number B, and make A have some kind of property. If it exists, try B; if it doesn’t, try to explain the reason. ” Such questions are often seen in the middle exam questions in recent years.