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a - dlugosc
b - szerokosc
a = b+7
Obw = 2a + 2b
86 = 2(b+7) + 2b
86 = 2b+14+2b
4b = 72
b = 18
a = b + 7
a = 18 + 7
a = 25
Pozdrawiam i licze na naj:)
2a+2b=86
2b+14+2b=86
4b=72
b=18
a=b+7=18+7=25
P=25*18=450
b-długość działki
b=a+7
2a+2b=86
b=a+7
2a+2(a+7)=86
b=a+7
2a+2a+14=86
b=a+7
4a=72/:4
b=a+7
a=18
b=25
a=18
Pow działki =25*18=450 cm²