搜搜做题作业网计算下列各题
来源：学生作业帮 编辑：搜搜做题作业网作业帮 分类：数学作业 时间：2024/05/04 19:47:14
计算下列各题
解
原式
=(x^2-y)/(x-3)^2-(9-y)/(x-3)^2
=(x^2-y-9+y)/(x-3)^2
=(x^2-9)/(x-3)^2
=(x-3)(x+3)/(x-3)^2
=(x+3)/(x-3)
原式
=(a^2-1)/(a^2-2a)-(4a-5)/(a^2-2a)
=(a^2-1-4a+5)/(a^2-2a)
=(a^2-4a+4)/a(a-2)
=(a-2)^2/a(a-1)
=(a-2)/a
原式
=(x^2-y)/(x-3)^2-(9-y)/(x-3)^2
=(x^2-y-9+y)/(x-3)^2
=(x^2-9)/(x-3)^2
=(x-3)(x+3)/(x-3)^2
=(x+3)/(x-3)
原式
=(a^2-1)/(a^2-2a)-(4a-5)/(a^2-2a)
=(a^2-1-4a+5)/(a^2-2a)
=(a^2-4a+4)/a(a-2)
=(a-2)^2/a(a-1)
=(a-2)/a