Matematică, întrebare adresată de dasasterbec22, 8 ani în urmă

вычислите периметр четырёхугольника!!помогите пожалуйста, контрольная)

Anexe:

aslan27: pls speak in english

dasasterbec22: ok

dasasterbec22: I said: count the perimeter and the length of the sides of the quadrilateral !!! help me please

albatran: use google tyranslate into romania or go ti the Russian section

Răspunsuri la întrebare

Răspuns de targoviste44

$\it \mathcal{P}=2\cdot(a+b) \Rightarrow \begin{cases}\ \it a=\dfrac{\mathcal{P}}{2}-b\\ \\ \it b=\dfrac{\mathcal{P}}{2}-a \end{cases}$

$\it I)\ b=\dfrac{17,2}{2}-2,75=8,6-2,75=...\\ \\ \\ II)\ a=\dfrac{25,34}{2}-2,7=12,67-2,7=...\\ \\ \\ III)\ \ \mathcal{P}=2\cdot(18,2+38,7)=2\cdot56,9=...\\ \\ \\ IV)\ \ \mathcal{P}=2\cdot(2\dfrac{1}{2}+1\dfrac{1}{3})=5+2\dfrac{2}{3}=7\dfrac{2}{3}\\ \\ \\ VI)\ b=\dfrac{7\dfrac{3}{10}}{2}-2\dfrac{1}{5}=\dfrac{73}{20}-\dfrac{^{4)}11}{\ 5}=\dfrac{73-44}{20}=\dfrac{29}{20}$