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a=2
b=3
P=5
x=h=?
P=(a+b)*h/2
5=(2+3)*h/2 obustronnie*2
10=5*h obustronnie:5
2=h
x=2
b.
a=x
b=4
h=6
P=18
18=(x+4)*6/2
18=(x+4)*3 obustronnie :3
6=x+4 obustronnie -4
x=2
c.
a=x
b=2x
h=2
P=6
6=(x+2x)*2/2
6=3x*1
6=3x obustronnie :3
2=x
a=2
b=2*2=4