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Ответ

Ответ дан
michindjeva
Р= (а+в)×2=14
а+в=7
х одна сторона
7-х другая сторона
составляем уравнение S=a×h1=в×h2
3x = 5.4(7 - x) \ 3x = 37.8 - 5.4x \ 3x  + 5.4x = 37.8 \ 8.4x = 37.8 \ x = 4.5\ 7 - 4.5=2.5
S=4.5×3=13,5 площадь параллелограмма

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