Решите, пожалуйста, уравнения))))
1) 7x^2-9x+2=0
2) 5x^2=12x
3) 7x^2-28=0
4) x^2+20+91=0
1) 7x^2-9x+2=0
2) 5x^2=12x
3) 7x^2-28=0
4) x^2+20+91=0
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