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h=3 cm
podstawy:x,x+5
P=1/2(x+x+5)*h
18=1/2(2x+5)*3
36=6x+15
6x=36-15
6x=21
x=21:6
x=3,5
x+5=8,5
ODP. : Podstawy wynoszą:3,5cm i 8,5 cm.
POZDRAWIAM ;)
18cm² = (a+b)3/2 /×2
36cm² = (a+b)×3 / :3
12cm² = a+b
a= 8½
b=3½
a-b =5