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(a+b)*9= 126+3a
9a+9b= 126+3a
a=2b
6a+9b=126
a=2b
21b=126
b=6
a=2b
a=12
b=6
6a+9b=126
2a+2b=54-18
6a+9b=126
2a+2b=36
6a+9b=126
2a=36-2b/2
6a+9b=126
a=18-b
6*(18-b)+9b=126
a=18-b
108-6b+9b=126
a=18-b
3b=126-108
a=18-b
3b=18/3
a=18-b
b=6
a=12
b=6
Pole figury BCDG=6²=36
b=6
Pole figury DEFG=b*3=6*3=18
Obwód figury=a+b+9+b+3+a+6
Ob fig ACEFGH=54
a+b+9+b+3+a+6=54
a+6+9+6+3+a+6=54
2a=24
a=12
Pole figury ABGH=6a
Pole figury ABGH=6*12=72
Pole fig ACEFGH=126
Pole fig ACEFGH=Pole ABGH+ Pole BCDG + Pole DEFG
126=72+36+18