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2a*5+2b*5=170 //:10
a*b=70
b=17-a
17a-a²-70=0
delta=289-280=9 0<a<17
sqrt delta= 3
-17-3/(-2)=10
-17+3/(-2)=7
Odp: podstawa ma wymiary 10x7cm
V=a*b*H 170=10a+10b
350=a*b*5 17=a+b
a*b=70 a=17-b
(17-b)*b=70
17b-b²=70
b²-17b+70=0
Δ=9
b=7 v b=10
b=7 v b=10
a=10 a=7