Question

初二数学约分题目

X^2-(y-z)^2\(x+y)^2-z^2
回答清楚一点啊！！
约分的

Answer 1

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)

Answer 2

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)