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1/2×3×4+1/3×4×5+1/5×6×7分数简算
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1/2×3×4+1/3×4×5+1/5×6×7分数简算
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答案和解析
漏了1/4×5×6
原式=1/2×(1/2×3-1/3×4+1/3×4-1/4×5+1/4×5-1/5×6+1/5×6-1/6×7)
=1/2×(1/2×3-1/6×7)
=1/14
原式=1/2×(1/2×3-1/3×4+1/3×4-1/4×5+1/4×5-1/5×6+1/5×6-1/6×7)
=1/2×(1/2×3-1/6×7)
=1/14
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