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2x+y=x+9
x+y=9
x+9=3y-2x
3x-3y=-9/:3
x-y=-3
2x=6/:2
x=3
y=6
2x+y=6+6=12
x+4+5=3+9=12
3y-2x=18-6=12
Obw=3*a
Obw=3*12=36
2.P=a*h/:h
a=P/h
Proszę;)
Liczę na NAJ
2x+y=x+9
x+y=9
x+9=3y-2x
-9=3x-3y/:3
-3=x-y
6=2x/:2
x=3
y=6
2x+y=6+6=12
x+4+5=3+9=12
3y-2x=18-6=12
Ob=3*a
Ob=3*12=36
2.
P=a*h/:h
a=P:h