é¢ç®ï¼å¥å¥9å¹´åçå¹´é¾æ¯å¼å¼12å¹´åçå¹´é¾ï¼ç°å¨ä¸¤äººçå¹´é¾ä¹åæ¯27å²ï¼æ±å¥å¥ä»å¹´å¤å°å²ï¼
解ï¼è®¾å¥å¥ä»å¹´xå²ï¼å¼å¼27-xå²ï¼
x-9=27-x+12
x-9=39-x
x+x=39+9
2x=48
x=48÷2
x=24
çï¼å¥å¥ä»å¹´24å²ã
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