因式分解题目(写出过程)1. a²-b²-2b-1 2.(xy+1)²-(x+y)² 3.x²-2x-4y²-4y 4.(x²+2x)²-2(x²+2x)-3两楼的答案没完整= =
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![因式分解题目(写出过程)1. a²-b²-2b-1 2.(xy+1)²-(x+y)² 3.x²-2x-4y²-4y 4.(x²+2x)²-2(x²+2x)-3两楼的答案没完整= =](/uploads/image/z/10216865-65-5.jpg?t=%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%E9%A2%98%E7%9B%AE%28%E5%86%99%E5%87%BA%E8%BF%87%E7%A8%8B%291.+a%26sup2%3B-b%26sup2%3B-2b-1+++++++++++++++2.%EF%BC%88xy%2B1%EF%BC%89%26sup2%3B-%EF%BC%88x%2By%EF%BC%89%26sup2%3B+++++3.x%26sup2%3B-2x-4y%26sup2%3B-4y++++++++4.%EF%BC%88x%26sup2%3B%2B2x%EF%BC%89%26sup2%3B-2%EF%BC%88x%26sup2%3B%2B2x%EF%BC%89-3%E4%B8%A4%E6%A5%BC%E7%9A%84%E7%AD%94%E6%A1%88%E6%B2%A1%E5%AE%8C%E6%95%B4%3D+%3D)
因式分解题目(写出过程)1. a²-b²-2b-1 2.(xy+1)²-(x+y)² 3.x²-2x-4y²-4y 4.(x²+2x)²-2(x²+2x)-3两楼的答案没完整= =
因式分解题目(写出过程)
1. a²-b²-2b-1 2.(xy+1)²-(x+y)² 3.x²-2x-4y²-4y
4.(x²+2x)²-2(x²+2x)-3
两楼的答案没完整= =
因式分解题目(写出过程)1. a²-b²-2b-1 2.(xy+1)²-(x+y)² 3.x²-2x-4y²-4y 4.(x²+2x)²-2(x²+2x)-3两楼的答案没完整= =
1,a2-b2-2b-1 =a2-(b2+2b+1)
=a2-(b+1)2
=(a+b+1)(a-b-1)
2,(xy+1)2-(x+y)2=(xy+1+x+y)(xy+1-x-y)
=[(xy+x)+(y+1)][(xy-x)-(y-1)]
=[x(y+1)+y+1)][x(y-1)-(y-1)]
=(x+1)(y+1)(x-1)(y-1)
3,x2-2x-4y2-4y= x2-4y2-2x-4y
=(x+2y)(x-2y)-2(x+2y)
=(x-2y-2)(x+2y)
4,(x2+2x)2-2(x2+2x)-3=(x2+2x+1)(x2+2x-3)
=(x+1)2(x-1)(x+3)
楼主,以上过程相当详细,不信你看不懂.
记得给分哦~
1. a²-b²-2b-1
=a^2-(b+1)^2
=(a+b+1)(a-b-1)
2.(xy+1)²-(x+y)²
=(xy+1+x+y)(xy+1-x-y)
3.x²-2x-4y²-4y
=(x+2y)(x-2y)-2(x+2y)
=(x+2y)(x-2y-2)
4.(x²+2x)²-2(x²+2x)-3
=(x^2+2x+1)(x^2+2x-3)
1,a2-b2-2b-1 =a2-(b2+2b+1)
=a2-(b+1)2
=(a+b+1)(a-b-1)
2,(xy+1)2-(x+y)2=(xy+1+x+y)(xy+1-x-y)
=[(xy+x)+(y+1)][(xy-x)-(y-1)]
...
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1,a2-b2-2b-1 =a2-(b2+2b+1)
=a2-(b+1)2
=(a+b+1)(a-b-1)
2,(xy+1)2-(x+y)2=(xy+1+x+y)(xy+1-x-y)
=[(xy+x)+(y+1)][(xy-x)-(y-1)]
=[x(y+1)+y+1)][x(y-1)-(y-1)]
=(x+1)(y+1)(x-1)(y-1)
3,x2-2x-4y2-4y= x2-4y2-2x-4y
=(x+2y)(x-2y)-2(x+2y)
=(x-2y-2)(x+2y)
4,(x2+2x)2-2(x2+2x)-3=(x2+2x+1)(x2+2x-3)
=(x+1)2(x-1)(x+3)
楼主,以上过程相当详细,不信你看不懂。。。
记得给分哦~
收起