5X² 6XY-8X²因式分解还有7X²+13X-2
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5X² 6XY-8X²因式分解还有7X²+13X-2
5X² 6XY-8X²因式分解
还有7X²+13X-2
5X² 6XY-8X²因式分解还有7X²+13X-2
第一题后面应该是 Y²吧、、、、
5X²+6XY-8Y²=(x+2y)(5x-4y)
7X²+13X-2 =(x+2)(7x-1)