4x²-(y+z)² x²-(a+b+c)² 因式分解
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4x²-(y+z)² x²-(a+b+c)² 因式分解
4x²-(y+z)² x²-(a+b+c)² 因式分解
4x²-(y+z)² x²-(a+b+c)² 因式分解
4x²-(y+z)²
=(2x+y+z)(2x-y-z)
x²-(a+b+c)²
=(x+a+b+c)(x-a-b-c)