Ответ:
1=x-39
2=x
3=3×(x-39)
P=189
P=a+b+c
x-39+x+3×(x-39)=189
x+x-39+3x-117=189
5x=189+117+39
5x=345
x=345÷5
x=69
69-39=30
3×30=90
30+69+90=189
189=189
ответ 1=30, 2=69, 3=90
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Ответ:
1=x-39
2=x
3=3×(x-39)
P=189
P=a+b+c
x-39+x+3×(x-39)=189
x+x-39+3x-117=189
5x=189+117+39
5x=345
x=345÷5
x=69
69-39=30
3×30=90
30+69+90=189
189=189
ответ 1=30, 2=69, 3=90