十字相乘法(1)x²+4x—21= (2)t²+3t—10 (3)m²+4m—12(4)x四次方—7x²—18= (5)x六次方+8x三次方+15= (6)m²x²—8mx+12= (7)x²+11xy+18y²=
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![十字相乘法(1)x²+4x—21= (2)t²+3t—10 (3)m²+4m—12(4)x四次方—7x²—18= (5)x六次方+8x三次方+15= (6)m²x²—8mx+12= (7)x²+11xy+18y²=](/uploads/image/z/2100304-64-4.jpg?t=%E5%8D%81%E5%AD%97%E7%9B%B8%E4%B9%98%E6%B3%95%EF%BC%881%EF%BC%89x%26%23178%3B%2B4x%E2%80%9421%3D+%EF%BC%882%EF%BC%89t%26%23178%3B%2B3t%E2%80%9410+%EF%BC%883%EF%BC%89m%26%23178%3B%2B4m%E2%80%9412%EF%BC%884%EF%BC%89x%E5%9B%9B%E6%AC%A1%E6%96%B9%E2%80%947x%26%23178%3B%E2%80%9418%3D+%EF%BC%885%EF%BC%89x%E5%85%AD%E6%AC%A1%E6%96%B9%2B8x%E4%B8%89%E6%AC%A1%E6%96%B9%2B15%3D+%EF%BC%886%EF%BC%89m%26%23178%3Bx%26%23178%3B%E2%80%948mx%2B12%3D+%EF%BC%887%EF%BC%89x%26%23178%3B%2B11xy%2B18y%26%23178%3B%3D)
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