5x+8x=26013x=260/13x=205x=20*5=1008x=20*8=160Odp.obwód tych figur to 100cm i 160cm
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5x+8x=260
13x=260/13
x=20
5x=20*5=100
8x=20*8=160
Odp.obwód tych figur to 100cm i 160cm