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b =5a
2a+2b=54
2a+2*5a=54
12a=54 /:12
a=4,5 cm
b=5*4,5=22,5 cm
2.
b=a+5
a+2b=85
a+2(a+5)=85
a+2a+10=85
3a=75 /:3
a=25 dm
b=25+5=30 dm