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方程:設原來正方形的邊長為X釐米,則現在正方形的邊長為(X-2)釐米.X²;-(X-2)²;=28X²;-X²;4X-4=284X=32 X=88*8=64(釐米)答:原來這個正方形的面積是64釐米.算術:(28-4)除以2= 12(釐米)12除以…
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