化简【 { a³-8分之a³+2a²+4a}-{a²+a-6分之10}】
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化简【 { a³-8分之a³+2a²+4a}-{a²+a-6分之10}】
化简 【 { a³-8分之a³+2a²+4a}-{a²+a-6分之10}】÷ 【1- { a²-4分之21}】乘【a-2分之a+3】
化简 【 { a³-8分之a³+2a²+4a}-{a²+a-6分之10}】÷ 【1- { a²-4分之21}】乘【a-2分之a+3】
[{a³-8分之a³+2a²+4a}-{a²+a-6分之10}]÷[1- { a²-4分之21}]×[a-2分之a+3]
=[{(a-2)(a²+2a+4)分之a(a²+2a+4}-{(a-2)(a+3)分之10}]÷[a²-4分之a²-25]×[a-2分之a+3]
=[(a-2)分之a-(a-2)(a+3)分之10]÷[(a-2)(a+2)分之(a-5)(a+5)]×[(a-2)分之(a+3)]
=[(a-2)(a+3)分之a(a+3)-10]×[(a-5)(a+5)分之(a-2)(a+2)]×[(a-2)分之(a+3)]
=[(a-2)(a+3)分之(a-2)(a+5)]×[(a-5)(a+5)分之(a+2)(a+3)]
=[(a+3)分之(a+5)]×[(a-5)(a+5)分之(a+2)(a+3)]
=(a-5)分之(a+2)
再问: 第三部到第四部没懂?增么变化的?
再答: =[(a-2)(a+3)分之a(a+3)-10]×[(a-5)(a+5)分之(a-2)(a+2)]×[(a-2)分之(a+3)] =[(a-2)(a+3)分之(a²+3a-10)]×[(a-5)(a+5)分之(a-2)(a+2)]×[(a-2)分之(a+3)] =[(a-2)(a+3)分之(a-2)(a+5)]×[(a-5)(a+5)分之(a+2)(a+3)]
再问: =[(a-2)(a+3)分之(a²+3a-10)]×[(a-5)(a+5)分之(a-2)(a+2)]×[(a-2)分之(a+3)] =[(a-2)(a+3)分之(a-2)(a+5)]×[(a-5)(a+5)分之(a+2)(a+3)] 这两部是怎么变得?约了分也变不出来啊?我约分后是(a²-25)(a-2)分之(a²+3a-10)(a+2)
再答: [(a-5)(a+5)分之(a-2)(a+2)]×[(a-2)分之(a+3)] =(a-5)(a+5)(a-2)分之(a-2)(a+2)(a+3) 约分 =(a-5)(a+5)分之(a+2)(a+3)
=[{(a-2)(a²+2a+4)分之a(a²+2a+4}-{(a-2)(a+3)分之10}]÷[a²-4分之a²-25]×[a-2分之a+3]
=[(a-2)分之a-(a-2)(a+3)分之10]÷[(a-2)(a+2)分之(a-5)(a+5)]×[(a-2)分之(a+3)]
=[(a-2)(a+3)分之a(a+3)-10]×[(a-5)(a+5)分之(a-2)(a+2)]×[(a-2)分之(a+3)]
=[(a-2)(a+3)分之(a-2)(a+5)]×[(a-5)(a+5)分之(a+2)(a+3)]
=[(a+3)分之(a+5)]×[(a-5)(a+5)分之(a+2)(a+3)]
=(a-5)分之(a+2)
再问: 第三部到第四部没懂?增么变化的?
再答: =[(a-2)(a+3)分之a(a+3)-10]×[(a-5)(a+5)分之(a-2)(a+2)]×[(a-2)分之(a+3)] =[(a-2)(a+3)分之(a²+3a-10)]×[(a-5)(a+5)分之(a-2)(a+2)]×[(a-2)分之(a+3)] =[(a-2)(a+3)分之(a-2)(a+5)]×[(a-5)(a+5)分之(a+2)(a+3)]
再问: =[(a-2)(a+3)分之(a²+3a-10)]×[(a-5)(a+5)分之(a-2)(a+2)]×[(a-2)分之(a+3)] =[(a-2)(a+3)分之(a-2)(a+5)]×[(a-5)(a+5)分之(a+2)(a+3)] 这两部是怎么变得?约了分也变不出来啊?我约分后是(a²-25)(a-2)分之(a²+3a-10)(a+2)
再答: [(a-5)(a+5)分之(a-2)(a+2)]×[(a-2)分之(a+3)] =(a-5)(a+5)(a-2)分之(a-2)(a+2)(a+3) 约分 =(a-5)(a+5)分之(a+2)(a+3)
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