用平方差公式
x²-(y-z)²/(x+y)²-z²
=(x+y-z)(x-y+z)/(x+y+z)(x+y-z)
=(x-y+z)/(x+y+z)
X^2-(y-z)^2\(x+y)^2-z^2
X^2-(y-z)^2\(x+y)^2-z^2
回答清楚一点啊!
约分的
回答清楚一点啊!
约分的
数学人气:533 ℃时间:2020-02-18 21:52:38
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