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b- dłuzszy bok
Obw=24
2a+2b=24
a+b=12
Oraz mam, że :
a=2b
a+b=12
a=2b
2b+b=12
a=2b
3b=12
a=2b
b=4
a=8
P=ab
P=32
a=1/2 x 1/2*8=4
b=x 8
obl
a i b=?
rozw
2*1/2x+2x=24
3x=24/:3
x=8
x+2x=24
3x=24\3
x=8
8dm×2=16dm
24dm-16dm=8dm
8dm÷2=4dm
P=a×b
P=8dm×4dm=32dm²
32dm²=320cm²