Răspuns :
2(l+L)=214
l+L=214:2
l+L=107
l=7+L/3
L+7+L/3=107
4L+21=321
4L=300
L=300:4
L=75
l=7+25
l=32
A=L*l
A=75*32
A=2400
A1+A2+A3=A
A1=A2
2A1+A3=2400
A3=600+(A1+A2)-din text
2A1+600+2A1=2400
4A1+600=2400
4A1=2400-600
4A1=1800
A1=450=A2
l+L=214:2
l+L=107
l=7+L/3
L+7+L/3=107
4L+21=321
4L=300
L=300:4
L=75
l=7+25
l=32
A=L*l
A=75*32
A=2400
A1+A2+A3=A
A1=A2
2A1+A3=2400
A3=600+(A1+A2)-din text
2A1+600+2A1=2400
4A1+600=2400
4A1=2400-600
4A1=1800
A1=450=A2
2(l+L)=214
l+L=214:2
l+L=107
l=7+L/3
L+7+L/3=107
4L+21=321
4L=300
L=300:4
L=75
l=7+25
l=32
A=L*l
A=75*32
A=2400
A1+A2+A3=A
A1=A2
2A1+A3=2400
A3=600+(A1+A2)-din text
2A1+600+2A1=2400
4A1+600=2400
4A1=2400-600
4A1=1800
A1=450=A2
A3=2400-2*450
A3=2400-900
A3=1500
l+L=214:2
l+L=107
l=7+L/3
L+7+L/3=107
4L+21=321
4L=300
L=300:4
L=75
l=7+25
l=32
A=L*l
A=75*32
A=2400
A1+A2+A3=A
A1=A2
2A1+A3=2400
A3=600+(A1+A2)-din text
2A1+600+2A1=2400
4A1+600=2400
4A1=2400-600
4A1=1800
A1=450=A2
A3=2400-2*450
A3=2400-900
A3=1500