Odpowiedzi

2010-03-16T19:13:16+01:00
A=?
b=3a

3a+a+3a+a=168cm
8a=168cm
a=168cm:8
a=21cm
b=3x21cm
b=63cm

P=axb
P=21cmx63cm
P=1323cm2
3 4 3
2010-03-16T20:14:25+01:00
2a+2b = 168 cm
b = 3a

2a+2*3a = 168
2a+6a = 168
8a = 168 /:8
a = 21cm
b = 3*21
b = 63 cm

P = a*b
P = 21*63
P = 1323 cm²
1 5 1