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ï¼6x1+6x3+1x3)x2-1x1x4
=54-4
=50å¹³æ¹åç±³
é®é¢äº:æ¯å¹³æ¹åç±³éé7.8å
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7.8x(6x1x3-1x1x1x2)
=7.8x16
=124.8å
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