约分:(x+y)² -z²分之x²-(y-z)²
约分:(x+y)² -z²分之x²-(y-z)²
其他人气:531 ℃时间:2020-01-29 13:44:16
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Tiamo_碓冰,你好: [x²-(y-z)²]/[(x+y)²-z²].分母是(x+y)²-z²,分子是x²-(y-z)²=[(x+y-z)(x-y+z)]/[(x+y+z)(x+y-z)].用平方差公...
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