Odpowiedź:
3x+10x=39
13x=39 /:13
x=3cm
3x= 3×3=9cm
10x=10×3=30cm
P=a×b= 9×30=270cm2
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Odpowiedź:
3x+10x=39
13x=39 /:13
x=3cm
3x= 3×3=9cm
10x=10×3=30cm
P=a×b= 9×30=270cm2