∵a▲b=(a×1/2)÷(b÷1/3)∴1/8▲5/6 = (1/8×1/2) ÷ (5/6÷1/3) = 1/16 ÷ 5/2 = 1/8 × 1/5 = 1/40.
规定:a▲b=(a×1/2)÷(b÷1/3),如4▲2/5=(4×1/2)÷(2/5÷1/3)=5/3.那么1/8▲5/
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