化简分式:5x/(x²+x-6)+(2x-5)/(x²-x-12)-(7x-10)/(x²-6x+8)

来源:学生作业帮助网 编辑:作业帮 时间:2024/04/29 04:40:59
化简分式:5x/(x²+x-6)+(2x-5)/(x²-x-12)-(7x-10)/(x²-6x+8)

化简分式:5x/(x²+x-6)+(2x-5)/(x²-x-12)-(7x-10)/(x²-6x+8)
化简分式:5x/(x²+x-6)+(2x-5)/(x²-x-12)-(7x-10)/(x²-6x+8)

化简分式:5x/(x²+x-6)+(2x-5)/(x²-x-12)-(7x-10)/(x²-6x+8)
5x/(x²+x-6)+(2x-5)/(x²-x-12)-(7x-10)/(x²-6x+8)
=5x/(x+3)(x-2)+(2x-5)/(x-4)(x+3)-(7x-10)/(x-2)(x-4)
公分母是(x+3)(x-2)(x-4)
通分得
=[5x(x-4)+(2x-5)(x-2)-(7x-10)(x+3)]/(x+3)(x-2)(x-4)
=(5x²-20x+2x²-9x+10-(7x²+11x-30))/(x+3)(x-2)(x-4)
=(7x²-29x+10-7x²-11x+30)/(x+3)(x-2)(x-4)
=(-40x+40)/(x+3)(x-2)(x-4)
=-40(x-1)/[(x+3)(x-2)(x-4)]

=5X/{(X+3)(X-2)}+(2X-5)/{(X+3)(X-4)}-(7X-10)/{(X-2)(X-4)}=5X(X-4)/{(X+3)(X-4)(X-2)}+(2X-5)(X-2)/{(X+3)(X-4)(X-2)}-(7x-10)(X+3)/{(X+3)(X-4)(X-2)}=40(X+1)/{(X+3)(X-4)(X-2)}
这个应该是最简了