różnica obwodów dwóch kwadratów jest równa 76 a różnica ich pól wynosi 969. oblicz długości boków tych kwadratów
4x-4y=76
x²-y²=969
x-y=19 ⇒x=19+y
361+38y+y²-y²=969
38y=608
y=16
x=19+16=35
Dane:
I kwadrat :
bok : a
P= a²
Obw = 4a
II kwadrat :
bok : b
P= b²
Obw = 4b
4a- 4b = 76 /: 4
a² - b² = 969
a- b= 19
a= 19 +b
(19+b)² - b² = 969
a=19 +b
361 + 38b + b² - b² = 969
a= 19+b
38b = 969 – 361
a=19+b
38b = 608 / 38
b = 16
a= 19+16
b=16
a= 35
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4x-4y=76
x²-y²=969
x-y=19 ⇒x=19+y
x²-y²=969
361+38y+y²-y²=969
38y=608
y=16
x=19+16=35
Dane:
I kwadrat :
bok : a
P= a²
Obw = 4a
II kwadrat :
bok : b
P= b²
Obw = 4b
4a- 4b = 76 /: 4
a² - b² = 969
a- b= 19
a² - b² = 969
a= 19 +b
(19+b)² - b² = 969
a=19 +b
361 + 38b + b² - b² = 969
a= 19+b
38b = 969 – 361
a=19+b
38b = 608 / 38
b = 16
a= 19+16
b=16
a= 35