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[﹙3/4-3/8﹚×5/26+1/8×5/26]÷2又4/13
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[﹙3/4-3/8﹚×5/26+1/8×5/26]÷2又4/13
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[﹙3/4-3/8﹚×5/26+1/8×5/26]÷2又4/13
=【5/26×(3/4-3/8+1/8)】÷（30/13）
=[5/26×（3/4-1/4）]×13/30
=5/26×1/2×13/30
=5/2 ×1/2×1/30
=1/24
=【5/26×(3/4-3/8+1/8)】÷（30/13）
=[5/26×（3/4-1/4）]×13/30
=5/26×1/2×13/30
=5/2 ×1/2×1/30
=1/24
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