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設圓X三角Y方框Z 2X+Y+Z=66 1 X+2Y+Z=62 2 X+Y+2Z=64 3 由12得X-Y=4 X=Y+4 *代入2得3Y+Z=58 4 由23得Y-Z=-2 Y=Z-2 5由45得4Z=64 Z=16 代入5得Y=14代入*得X=18 即圓=18三角=14方框=16
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