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a4=(-3)^4 *(4-3)² =81*1=81
7)
a8=48-6=42
a7=42-6=36
a6=36-6=30
a5=30-6=24
a4=24-6=18
a3=18-6=12
a2=12-6=6 (odp)
8)
2P=(a+b)*h
2P=ah+bh
bh=2P-ah /h
b=2P-ah \h (odp)