初一数学整式的乘法(2)1、已知:ƒ﹙x﹚=x²-x-2,g﹙x﹚=x²-6x+8,p﹙x﹚=x²﹢3x﹢2计算:[ƒ﹝x﹞-g﹝x﹞]•p﹝x﹞2、若x³-6x²+11x-6=(x-1)(x²+mx+n),求m、n的值正确率要高.
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![初一数学整式的乘法(2)1、已知:ƒ﹙x﹚=x²-x-2,g﹙x﹚=x²-6x+8,p﹙x﹚=x²﹢3x﹢2计算:[ƒ﹝x﹞-g﹝x﹞]•p﹝x﹞2、若x³-6x²+11x-6=(x-1)(x²+mx+n),求m、n的值正确率要高.](/uploads/image/z/14324702-14-2.jpg?t=%E5%88%9D%E4%B8%80%E6%95%B0%E5%AD%A6%E6%95%B4%E5%BC%8F%E7%9A%84%E4%B9%98%E6%B3%95%EF%BC%882%EF%BC%891%E3%80%81%E5%B7%B2%E7%9F%A5%EF%BC%9A%26%23402%3B%EF%B9%99x%EF%B9%9A%3Dx%26%23178%3B-x-2%2Cg%EF%B9%99x%EF%B9%9A%3Dx%26%23178%3B-6x%2B8%2Cp%EF%B9%99x%EF%B9%9A%3Dx%26%23178%3B%EF%B9%A23x%EF%B9%A22%E8%AE%A1%E7%AE%97%EF%BC%9A%5B%26%23402%3B%EF%B9%9Dx%EF%B9%9E-g%EF%B9%9Dx%EF%B9%9E%5D%26%238226%3Bp%EF%B9%9Dx%EF%B9%9E2%E3%80%81%E8%8B%A5x%26%23179%3B-6x%26%23178%3B%2B11x-6%3D%EF%BC%88x-1%29%28x%26%23178%3B%2Bmx%2Bn%29%2C%E6%B1%82m%E3%80%81n%E7%9A%84%E5%80%BC%E6%AD%A3%E7%A1%AE%E7%8E%87%E8%A6%81%E9%AB%98.)
初一数学整式的乘法(2)1、已知:ƒ﹙x﹚=x²-x-2,g﹙x﹚=x²-6x+8,p﹙x﹚=x²﹢3x﹢2计算:[ƒ﹝x﹞-g﹝x﹞]•p﹝x﹞2、若x³-6x²+11x-6=(x-1)(x²+mx+n),求m、n的值正确率要高.
初一数学整式的乘法(2)
1、已知:ƒ﹙x﹚=x²-x-2,g﹙x﹚=x²-6x+8,p﹙x﹚=x²﹢3x﹢2
计算:[ƒ﹝x﹞-g﹝x﹞]•p﹝x﹞
2、若x³-6x²+11x-6=(x-1)(x²+mx+n),求m、n的值
正确率要高.
初一数学整式的乘法(2)1、已知:ƒ﹙x﹚=x²-x-2,g﹙x﹚=x²-6x+8,p﹙x﹚=x²﹢3x﹢2计算:[ƒ﹝x﹞-g﹝x﹞]•p﹝x﹞2、若x³-6x²+11x-6=(x-1)(x²+mx+n),求m、n的值正确率要高.
1,[ƒ﹝x﹞-g﹝x﹞]•p﹝x﹞
=(x²-x-2-x²+6x-8)﹙x²﹢3x﹢2)
=5(x-2)(x+1)(x+2)
=5(x²-4)(x+1)
=5x³+5x²-20x-20
2,
(x-1)(x²+mx+n),
=x³+(m-1)x²+(n-m)x-n
=x³-6x²+11x-6
即m-1=-6
n-m=11
n=6
故m=-5,n=6
1 :5﹙X-1﹚﹙X+1﹚²
2 :m=﹣5, n=6