大师作文网如图,计算题,这个题
来源：学生作业帮 编辑：大师作文网作业帮 分类：数学作业 时间：2024/11/06 06:57:00
如图,计算题,
这个题
这个题
原式=(a³-6a²+4a+8-a³+3a²-2a)/a(a-2)(a²-4a-4)*(a-2)/(a-4)
=(-3a²+2a+8)/a(a-2)(a²-4a-4)*(a-2)/(a-4)
=-(3a+4)(a-2)/a(a-2)(a²-4a-4)*(a-2)/(a-4)
=-(3a+4)(a-2)/a(a²-4a-4)(a-4)
当a=√2-1时,
原式=-（3√2+1)(√2-3)/(√2-1)(3-2√2-4√2+4-4)(√2-5)
=-(3-8√2)/(7-6√2)((3-6√2)
=-(3-8√2)/(93-60√2)
=-(3-8√2)(93+60√2)/(93²-60²×2)
=(681+564√2)/1449
=(-3a²+2a+8)/a(a-2)(a²-4a-4)*(a-2)/(a-4)
=-(3a+4)(a-2)/a(a-2)(a²-4a-4)*(a-2)/(a-4)
=-(3a+4)(a-2)/a(a²-4a-4)(a-4)
当a=√2-1时,
原式=-（3√2+1)(√2-3)/(√2-1)(3-2√2-4√2+4-4)(√2-5)
=-(3-8√2)/(7-6√2)((3-6√2)
=-(3-8√2)/(93-60√2)
=-(3-8√2)(93+60√2)/(93²-60²×2)
=(681+564√2)/1449