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x-jeden bok
x+2,5 dm -drugi bok
Ob= 2*a+2*b
19,4dm=2x+2(x+2,5dm)
19,4dm=4x+5dm
4x=14,4dm
x=3,6dm
x+2,5=6,1dm
P=a*b
P=3,6*6,1
P=21,96dm2
2.
x-jeden bok
0,65x-drugi bok
2x+2*0,65x=132cm
3,3x=132cm
x=40 cm
0,65x=26cm
P=40cm*26cm
P=1040cm2
:))