2x²-5X-12 7X²-19X-6X²Y²+2XY-8X²+2XY-8Y²
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2x²-5X-12 7X²-19X-6X²Y²+2XY-8X²+2XY-8Y²
2x²-5X-12
7X²-19X-6
X²Y²+2XY-8
X²+2XY-8Y²
2x²-5X-12 7X²-19X-6X²Y²+2XY-8X²+2XY-8Y²
2x²-5X-12
=(2x+3)(x-4)
7X²-19X-6
=(7x+2)(x-3)
X²Y²+2XY-8
=(xy+4)(xy-2)
X²+2XY-8Y²
=(x+4y)(x-2y)
都可以用十字相乘法啊
1.(X-4)(2X+3)
2.(X-3)(7X+2)
3.(XY+4)(XY-2)
4.(X-4Y)(X+2Y)
高手分解一下。绝对可以分解。求高手问题补充:据说要用到3分之一次方。 需要过程 看中立方和公式吧,挺好用的 B A a b = (根号a