Un rombo e un trapezio isoscele hanno lo stesso perimetro. La base maggiore del trapezio misura 50 cm , quella minore 26 cm , ogni lato obliquo è congruente ai \( \frac{2}{5} \) della base maggiore. Determina la misura del lato del rombo. \( [29 \mathrm{~cm}] \)

Aida recorre 18 him a us hota en que tiempo to hizo

\( \left. \begin{array} { l } { A ( - 5 ; 4,1 ) } \\ { B \quad ( 2,9 , - 1 ) } \\ { C \quad ( 3 , - 5,4 ) } \\ { B \quad ( 7,2,6 ) } \end{array} \right. \)

Escribir V, si la igualdad es verdadera, o F, si es falsa. \( \cos 70^{\circ} \cos 20^{\circ}-\operatorname{sen} 70^{\circ} \operatorname{sen} 20^{\circ}=0 \) \( \operatorname{sen} 40^{\circ} \cos 50^{\circ}-\operatorname{sen} 50^{\circ} \cos 40^{\circ}=1 \) \( \frac{\tan 20^{\circ}+\tan 25^{\circ}}{1-\tan 20^{\circ} \tan 25^{\circ}}=1 \) \( \frac{\tan 50^{\circ}-\tan 35^{\circ}}{1-\tan 50^{\circ} \tan 35^{\circ}}=2-\sqrt{3} \)

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D. Determine whether the expressions and \( \begin{array}{ll}\text { 1. }(5 x+3)+3 x^{2}-2 \text { and }(5 x+1)+3 x^{2} & \text { 2. } 3 x^{2}+(x-2)(x+1) \text { and }(2 x-2)(2 x+14 \\ \text { 3. }(2 x+1)^{2}-2 x(x-3) \text { and } & \text { 4. }\left(7 x^{2}+1\right)-(3 x-1)(x+4) \text { and } \\ 6 x^{2}+6 x+2-(2 x-1)^{2} & 2 x(x-3)+2 x^{2}-5 x+5\end{array} \) \( \begin{array}{ll}\text { 5. } 6 x(x+1) \text { and } 6 x^{2}+6 & \text { 6. } 8 x(2 x+1)+8 x^{2} \text { and } \sin (3 x+1)\end{array} \)