1.3-48y^22.(x+n)^2-93.49u^2-(x-y)^2

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1.3-48y^22.(x+n)^2-93.49u^2-(x-y)^2
1.3-48y^2
2.(x+n)^2-9
3.49u^2-(x-y)^2

1.3-48y^22.(x+n)^2-93.49u^2-(x-y)^2
1.3-48y^2
=3(1-16y^2)
=3(1+4y)(1-4y)
2.(x+n)^2-9
=(x+n+3)(x+n-3)
3.49u^2-(x-y)^2
=[7u+(x-y)][7u-(x-y)]
=(7u+x-y)(7u-x+y)
平方差公式：a^2-b^2=(a+b)(a-b)

好难,成绩不过关!

主要考察平方差公式！a^2-b^2=(a+b)(a-b)
1. 3-48y^2
=3(1-16y^2)
=3(1+4y)(1-4y)
2. (x+n)^2-9
=(x+n+3)(x+n-3)
3. 49u^2-(x-y)^2
=[7u+(x-y)][7u-(x-y)]
=(7u+x-y)(7u-x+y)

1.3-48y^22.(x+n)^2-93.49u^2-(x-y)^2 因式分解 x^2n+6x^n-y^2+9 m(x-y)^n+n(y-x)^2n因式分解 x^n*y*(-x^2y^m) 已知x^m+n=9,y^m+n=16,求（-三分之一*x^m*y^n)^2*x^2n*y^2n的值? 已知x^m+n=9,y^m+n=16,求（-三分之一*x^m*y^n)^2*x^2n*y^2n的值? y^2-9(x+y)^2.a(x-y)-b(y-x)+c(x-y)..x（m+n)-y(n+m)+(m+n)..(x+y)^2-16(x-y)^2因式分解 {2m+9n=48 {3m-5n=-15 求x和y 分解因式 x^n+2 *y^n-2+x^n+1* y^n-1+x^n+1* y^n-1 (x+y)(m+n)2-(x+y)(m+n)2 x^2n-y^2n(因式分解) 因式分解：①x^2*(x-y)+y^2*(y-x) ②25(m+n)^2-9n^2 2x^6n-x^4n×y^3m-y^9m,已知x^2n=3,y^3n=2,求值分解因式 4m^2(x+y)^2-12mn(x+y)(x-y)+9n^2(x-y)^2? 分解因式 4m^2(x+y)^2-12mn(x+y)(x-y)+9n^2(x-y)^2 因式分解（公式法)4(x+2y)^2-9(x-y)^2x^(n+3)-x^(n-1) 1.x^n-13x^n-1+36x^n-22.x^2y^2+13xy+363.X^2+15xy+36y^24.（x+y）^2-9(x+y)-365.（a^2+36）^2-8(a^2+3b)-206.12x^2-5x-37.36a^2-15a+18.4x^3-16xy-15y^2..TAT 计算：（x^2n-2x^ny^n+y^2n)/(x^n-y^n)（n为正整数）=