x-1сторона
y-2cторона
z-3сторона
x+y=33
x+z=39
y+z=42
x=33-y
33-y+z=39
-y+z=6
2z=48
z=24
-y+24=6
y=18
x=15
15+18+24=57 (см)-периметр
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Verified answer
x-1сторона
y-2cторона
z-3сторона
x+y=33
x+z=39
y+z=42
x=33-y
33-y+z=39
y+z=42
-y+z=6
2z=48
z=24
-y+24=6
y=18
x=15
15+18+24=57 (см)-периметр