帮我解一下这个方程(1-n)²+【3-(5/6)n²-(13/6)n】²=20
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去分母:(5n^2+13n-18)^2+36(n-1)^2-720=0
(5n+18)^2(n-1)^2+36(n-1)^2-720=0
令n-1=t, 方程化为:5t^4+46t^3+113t^2-144=0
5t^4+20t^3+26t^3+104t^2+9t^2+36t-36t-144=0
(t+4)(5t^3+26t^2+9t-36)=0
t+4=0得t1=-4
(5t^3+26t^2+9t-36)=0需用卡丹公式,得:
t2=-4.42568727767207
t3=0.945793754982935
t4=-1.72010647731085
因此原方程的解为:n=t+1
n1=-3
n2=-3.42568727767207
n3=1.945793754982935
n4=-0.72010647731085
(5n+18)^2(n-1)^2+36(n-1)^2-720=0
令n-1=t, 方程化为:5t^4+46t^3+113t^2-144=0
5t^4+20t^3+26t^3+104t^2+9t^2+36t-36t-144=0
(t+4)(5t^3+26t^2+9t-36)=0
t+4=0得t1=-4
(5t^3+26t^2+9t-36)=0需用卡丹公式,得:
t2=-4.42568727767207
t3=0.945793754982935
t4=-1.72010647731085
因此原方程的解为:n=t+1
n1=-3
n2=-3.42568727767207
n3=1.945793754982935
n4=-0.72010647731085
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