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P=a×b
P=30×21
P=630cm²
Teraz pole marginesów:
P=2×23×2+3×17+4×17
P=92+51+64
P=207cm²
Teraz obliczamy ile procent kartki stanowią marginesy:
100 pr. -- 630cm²
xpr. -- 207cm²
630x=100×207
630x=20700
x=20700÷630
x=32,8≈33 procent
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