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128=28b/28
b≈4,57
128 cm²=28 cm ×b
b=128 cm²:28 cm
b=4 i 12/16
b=4 i 3/4 cm
b= 4 cm i 75 mm
P= 128 cm b= ?
a= 28 cm
P=ab |a
P/a=b
128cm/28cm = b
b≈4,57 cm
Odpowiedź: Bok b ma długość 4,57 cm.