作业帮计算：(x^3-3x^2)/(x^2+5x+6)÷(x^3-9x)/(x^2+2x-3)*(x+2)/(2x)
来源：学生作业帮 编辑：拍题作业网作业帮 分类：数学作业 时间：2024/04/29 06:38:53
计算：(x^3-3x^2)/(x^2+5x+6)÷(x^3-9x)/(x^2+2x-3)*(x+2)/(2x)
(1)/(a-1)+(1)/(a+1)-(a^2+1)/(a^2-1)
(1)/(a-1)+(1)/(a+1)-(a^2+1)/(a^2-1)
1.(x^3-3x^2)/(x^2+5x+6)÷(x^3-9x)/(x^2+2x-3)*(x+2)/(2x)
=x^2(x-3)/(x+2)(x+3) * (x+3)(x-1)/x(x+3)(x-3) * (x+2)/2x
=(x-1)/2(x+3)
(1)/(a-1)+(1)/(a+1)-(a^2+1)/(a^2-1)
=(a+1+a-1)/(a²-1)-(a²+1)/(a²-1)
=(a²+2a+1)/(a²-1)
=(a+1)²/(a-1)(a+1)
=(a+1)/(a-1)
=x^2(x-3)/(x+2)(x+3) * (x+3)(x-1)/x(x+3)(x-3) * (x+2)/2x
=(x-1)/2(x+3)
(1)/(a-1)+(1)/(a+1)-(a^2+1)/(a^2-1)
=(a+1+a-1)/(a²-1)-(a²+1)/(a²-1)
=(a²+2a+1)/(a²-1)
=(a+1)²/(a-1)(a+1)
=(a+1)/(a-1)
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