помогите решить уравнения пожалуйста!
^ (это степень)
1. y^4 - 7y^2 - 144= 0
2. 36x^4 -13x^2 +1=0
3. y^4 - 8y^2 +16=0
4. (2x-1)^2 -25 (2x-1) +144=0
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