已知a的2次方-3a+1=0,求2a的5次方-5a的4次方+2a的3次方-8a的2次方/a的2次方+1
已知a的2次方-3a+1=0,求2a的5次方-5a的4次方+2a的3次方-8a的2次方/a的2次方+1
其他人气:845 ℃时间:2020-04-11 18:08:21
优质解答
a^2-3a+1=0a^2+1=3aa^2-3a=-1(2a^5-5a^4+2a^3-8a^2)/(a^2+1)=(2a^5-5a^4+2a^3-8a^2)/3a=(2a^4-5a^3+2a^2-8a)/3=[2a^2(a^2-3a+1)+a^3-8a]/3=(a^3-8a)/3=[a(a^2-3a+1)+3a^2-9a)/3...
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