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[" 13.If "(r)" ,denotes the number "rrr....

[" 13.If "(r)" ,denotes the number "rrr..." (n digits),where "r=12,3,...,9" and "a=(6)_(n),b=(8)_(n),c=(4)_(2n)" ,then "],[[" (a) "a^(2)+b+c=0," (b) "a^(2)+b-c=0," (c) "a^(2)+b-2c=0," (d) "a^(2)+b-x=]]

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