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8c-4d=4a/:4
a=(8c-4d):4
a=4(2c-d):4
a=2c-d - długość boku kwadratu
b)V=Pp*H
Pp=a2
2a3+a2=a2*H / :a2
(2a3+a2):a2=H
H=a2(2a+1)/ a2
H=2a+1
c)P=ah/2
1/2a2+3/2ab
1/2a2+3/2ab=ah/2 / *2
a2+3ab=ah /:a
h=a+3b