2a+2b=42
a=2b
2*2b+2b=42
4b+2b=42
6b=42
b=7 cm
a=2*7
a=14 cm
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x-pirszy bok
½x-drugi bok
ROZW:
L=2x+2*½x
42=2x+x----->/:3
x=14[cm]
Edit///
Zapomnią żem :P
½x=½*14=7[cm]
Więc:
pirszy bok-14[cm]
drugi bok - 7[cm]
Dla ciebie pisał Arek,
2a+2b=42
a=2b
2*2b+2b=42
4b+2b=42
6b=42
b=7 cm
a=2*7
a=14 cm
2x bok dluzszy
2x + 4x = 42
6x = 42
x = 7
dluzszy = 14
krótszy 7