xy²+2xy-3x-y²+2y-1 因式分解,要用到交叉相乘.老师帮忙给点提示.xy²+2xy-3x-y²+2y-1因式分解,要用到交叉相乘.老师帮忙给点提示.
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![xy²+2xy-3x-y²+2y-1 因式分解,要用到交叉相乘.老师帮忙给点提示.xy²+2xy-3x-y²+2y-1因式分解,要用到交叉相乘.老师帮忙给点提示.](/uploads/image/z/1163142-54-2.jpg?t=xy%26%23178%3B%2B2xy-3x-y%26%23178%3B%2B2y-1+%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%2C%E8%A6%81%E7%94%A8%E5%88%B0%E4%BA%A4%E5%8F%89%E7%9B%B8%E4%B9%98.%E8%80%81%E5%B8%88%E5%B8%AE%E5%BF%99%E7%BB%99%E7%82%B9%E6%8F%90%E7%A4%BA.xy%26%23178%3B%2B2xy-3x-y%26%23178%3B%2B2y-1%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%2C%E8%A6%81%E7%94%A8%E5%88%B0%E4%BA%A4%E5%8F%89%E7%9B%B8%E4%B9%98.%E8%80%81%E5%B8%88%E5%B8%AE%E5%BF%99%E7%BB%99%E7%82%B9%E6%8F%90%E7%A4%BA.)
xy²+2xy-3x-y²+2y-1 因式分解,要用到交叉相乘.老师帮忙给点提示.xy²+2xy-3x-y²+2y-1因式分解,要用到交叉相乘.老师帮忙给点提示.
xy²+2xy-3x-y²+2y-1 因式分解,要用到交叉相乘.老师帮忙给点提示.
xy²+2xy-3x-y²+2y-1
因式分解,要用到交叉相乘.老师帮忙给点提示.
xy²+2xy-3x-y²+2y-1 因式分解,要用到交叉相乘.老师帮忙给点提示.xy²+2xy-3x-y²+2y-1因式分解,要用到交叉相乘.老师帮忙给点提示.
十字相乘法?
xy²+2xy-3x-y²+2y-1
=(x-1)y^2+2(x+1)y-(3x+1)
十字相乘
1 -1
x-1 3x+1
=(y-1)[(x-1)y-(3x+1)]
=(y-1)(xy-3x-y-1)