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大正方形周長比小正方形的周長長20cm 則,大正方形邊長比小正方形邊長大20/4=5cm 設小正方形邊長為x cm;則大正方形邊長為x+5 cm (x+5)²;-x²;=35 10x+25=35 x=1 x+5=6 小正方形邊長為1 cm;大正方形邊長為6 cm
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