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Fie ABCD un dreptunghi: Daca aria ABCD = 98cm, AB=2BC, calculati AB si BC; Daca aria abcd = 192,5cm, AB=2,5cm, calculati BC; Daca AB= 3/7 •BC si aria abcd = 84 cm, calculqti ab si ac

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cristimarica

1)notam BC =x AB =2x A =L *l 98 =2x *x 98 =2x ^2 x ^2 =98/2 x ^2 =49 x =7  ;BC =7cm AB =2*7 AB =14 cm 2)A =192.5cm A =L* l 192.5 =2.5 *l l =192.5 /2.5 l =77  ; BC =77 cm 3)A =84cm  ;AB =3*BC /7  (notam BC =x) A =L * l 84 =3x /7 *x 84 =3x ^2 /7 3x^2 =84 *7 3x^2=588 x^2 =588/3 =196 x =14  ;BC =14 cm AB =3BC /7  AB =3*14 /7 AB =6cm  

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