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等於0時 (36-4a)/8=0 (36-4a)/8x8=0x8 36-4a=0 4a=36-0 4a=36 4a/4=36/4 a=9 等於1時 (36-4a)/8=1 (36-4a)/8x8=1x8 36-4a=8 4a/4=8/4 a=2
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