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z=2y-2
Obw. = x+y+z = 17
y+3 + y + 2y-2 = 17
4y=16 / :4
y=4
x=4+3=7
z=2*4-2 = 8-2=6
Długości tych boków to odpowiednio :
x=7 cm
y=4 cm
z=6 cm
y=1/2z+1
x=1/2z+4
z+1/2z+4+1/2z+1=17
2z=12
z=6
y=4
x=7