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a=b-10
2<b-10>+2b=100cm
2b-20+2b=100cm
4b=120cm
b=30cm
a=20cm
0,8 : 4 = 0,2m (20 cm)
0,2 + 0,1 = 0,3 m -> dłuższy bok
0,2m -> krótszy bok
50cm-10cm=2x
40cm=2x
x=20cm
Miary boków to 20cm,20cm,30cm,30cm