5x²+11xy+2y² 十字相乘法
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5x²+11xy+2y² 十字相乘法
5x²+11xy+2y² 十字相乘法
5x²+11xy+2y² 十字相乘法
5x²+11xy+2y² = (5x+y)(x+2y)
十字是:
5 1
1 2
5 1
1 2
=(5x+y)(x+2y)
啊晕 (5X+Y)(X+2Y)
5x²+11xy+2y²
=(5x+y)(x+2y)