(○十△)X(○十△)=121,已知○=7.5,求△=?

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(○十△)X(○十△)=121,已知○=7.5,求△=?(○十△)X(○十△)=121,已知○=7.5,求△=?(○十△)X(○十△)=121,已知○=7.5,求△=? 

(○十△)X(○十△)=121,已知○=7.5,求△=?
(○十△)X(○十△)=121,已知○=7.5,求△=?

(○十△)X(○十△)=121,已知○=7.5,求△=?