十字相乘法 1.x²+9x+8 2.y²-7y+12 3.m²+7m-18 4.t²-2t-8 5.x²-10x+24 6.x²-3x--10
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![十字相乘法 1.x²+9x+8 2.y²-7y+12 3.m²+7m-18 4.t²-2t-8 5.x²-10x+24 6.x²-3x--10](/uploads/image/z/1857962-2-2.jpg?t=%E5%8D%81%E5%AD%97%E7%9B%B8%E4%B9%98%E6%B3%95+1.x%26%23178%3B%2B9x%2B8+2.y%26%23178%3B-7y%2B12+3.m%26%23178%3B%2B7m-18+4.t%26%23178%3B-2t-8+5.x%26%23178%3B-10x%2B24+6.x%26%23178%3B-3x--10)
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十字相乘法 1.x²+9x+8 2.y²-7y+12 3.m²+7m-18 4.t²-2t-8 5.x²-10x+24 6.x²-3x--10
十字相乘法 1.x²+9x+8 2.y²-7y+12 3.m²+7m-18 4.t²-2t-8 5.x²-10x+24 6.x²-3x--10
十字相乘法 1.x²+9x+8 2.y²-7y+12 3.m²+7m-18 4.t²-2t-8 5.x²-10x+24 6.x²-3x--10
1.x²+9x+8
1 1
×
1 8
(x+1)(x+8)
2.y²-7y+12
1 -3
×
1 -4
(y-3)(y-4)
3.m²+7m-18
1 -2
×
1 9
(m-2)(m+9)
4.t²-2t-8
1 2
×
1 -4
(t+2)(t-4)
5.x²-10x+24
1 -4
×
1 -6
(x-4)(x-6)
6.x²-3x--10
1 2
×
1 -5
(x+2)(x-5)