2x-4/(x^2-4x-5)=A/(x-5)+B/(x+1),x≠5,-1.A.B的值是

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2x-4/(x^2-4x-5)=A/(x-5)+B/(x+1),x≠5,-1.A.B的值是
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2x-4/(x^2-4x-5)=A/(x-5)+B/(x+1),x≠5,-1.A.B的值是
2x-4/(x^2-4x-5)=A/(x-5)+B/(x+1),x≠5,-1.A.B的值是

2x-4/(x^2-4x-5)=A/(x-5)+B/(x+1),x≠5,-1.A.B的值是
等式两边同时乘以（X-5）（x+1)
德
2x-4=B（x-5)+A（x+1)=BX-5b+Ax+A
所以a+b=2
a-5b=-4
解得
b=1,a=1

*-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X || x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? matlab中a(x)=x^4+3x^3+9x-18 b(x)=x^5-4x^3-18x+7 c(x)=x^7+6x^5+9x^3-5x^2-2 d(x)=x^9-8x^7+6x^5-4x^4+d(x)=x^9-8x^7+6x^5-4x^4+6x^2+3 求e(x)=a(x)*b(x)*c(x)*d(x) ( A/X-5 ) + ( B/X+2 ) = 5X-4/X^2-3X-10 ^-^ 4x+1/(x-2)(x-5)=a/x-2+b/x-5 (x-3/x-2)-(x-2/x-1)=(x-5/x4) -(x-4/x-3) x-2x+3x-4x+5x.+99x-100x=25求解 2x+3x+4x+5x+x+6x+7x=100 x(x+1)+(x+2)+(x+3)+(x+4)+(x+5) = 27求x 若集合A={x|x^2-5x+4} 若集合A={x|x^2-5x+4} 已知集合A={x|x^2-5x+4 已知集合A={x｜x^2-5x+4 已知集合A={x|x^2-5x+4 知集合A={x｜x^2-5x+4 知集合A={x｜x^2-5x+4 已知A={X|X^-X-2>0}B={X|X^+4X-P x+2/x+1-x+4/x+3=x+6/x+5-x+8/x+7 x=?