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1、40×15÷100=6 40%=(6):15 2、長方形得長和寬比是7:3長减少12cm寬新增16cm就變成正方形,長方形面積是(1029)平方釐米 7X-12=3X+16 X=7 7X=49, 3X=21 49×21=1029(㎝²;)
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