(○+△)*(○+△)=121,已知○=7.5,求△=?

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(○+△)*(○+△)=121,已知○=7.5,求△=?

(○+△)*(○+△)=121,已知○=7.5,求△=?
(○+△)*(○+△)=121,已知○=7.5,求△=?

(○+△)*(○+△)=121,已知○=7.5,求△=?
将○=7.5代入方程:
(○+△)*(○+△)=121
7.5^2+2*7.5*△+△^2=121
△^2+15△-64.75=0
△^2+15△-259/4=0
(△+37/2)(△-7/2)=0
△=7/2或-37/2

将○=7.5代入方程:
(○+△)*(○+△)=121
7.5^2+2*7.5*△+△^2=121
△^2+15△-64.75=0
△^2+15△-259/4=0
(△+37/2)(△-7/2)=0
△=7/2或-37/2 请采纳,和加分!