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若x² -y² =9,xy=6,求x,y?学霸的方法你想不到
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考考你:x²-y²=9,xy=6,求x和y
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zjsjdjhebbbhbdbebxyebkxk
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已知x+y=6,xy=1且x<y,求x³-y³/x³+y³的值 - 西瓜视频
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jjxxyy0016作品051701 (1)
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bjyxszd... - 西瓜视频