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b= ramię
b=a+3cm
a+2(a+3)=42cm
a+2a+6=42
3a=42-6
3a=36
a=36:3
a=12cm
b=a+3cm=12+3=15cm
spr. 12+2×15=12+30=42cm
odp. podstawa ma 12cm a ramiona po 15cm
ob=a+b+c, przy czym b=a, czyli:
ob=2a+c
a-ramie
c-podstawa
a=c+3/*(-1)
42=2a+c
-a=-c-3
42=2a+c
+------
42-a=2a-3
-3a=-45/:(-3)
a=15
a=c+3
c=a-3
c=15-3
c=12
a=15
c=12