x-1/7x*4=36,

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x-1/7x*4=36,x-1/7x*4=36,x-1/7x*4=36,x-4/7x=367x^2-4-252x=0x=(252+-根号63616)/14=(126+-根号15904)/7先通分,再进

x-1/7x*4=36,
x-1/7x*4=36,

x-1/7x*4=36,
x-4/7x=36
7x^2-4-252x=0
x=(252+-根号63616)/14
=(126+-根号15904)/7

先通分,再进行解答

matlab!