4x²-(x-y)² 因式分解,希望还有人回答,快4x²-(x-y)² x²-(x-y)² -(a+b)²+(2a-3b)² 49(x-2)²-25(x-3)²
问题描述:
4x²-(x-y)² 因式分解,希望还有人回答,快
4x²-(x-y)² x²-(x-y)² -(a+b)²+(2a-3b)² 49(x-2)²-25(x-3)²
答
4x²-(x-y)²=(2x+x-y)(2x-x+y)=(3x-y)(x+y)x²-(x-y)²=(x+x-y)(x-x+y)=y(2x-y)-(a+b)²+(2a-3b)² =(2a-3b+a+b)(2a-3b-a-b)=(3a-2b)(a-4b)49(x-2)²-25(x-3)²=(7x-1...