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若長方形長和寬必須取整數,可解,否則無窮多解. 設長方形寬5x,長7x 則周長=2*(5x+7x)=24x x=2時,周長48,滿足題意 此時長=2*7=14,寬=2*5=10 面積=14*10=140
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