12分之7×7分之4-18分之3×26分之九简便方法？
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7/12×4/7 - 3/18×9/26
= 4/12×7/7 - 9/18×3/26
= 1/3×1 - 1/2×3/26
= 1/3 - 3/52
= 52/156 - 9/156
= 43/156
==================
7/12×4/7 - 13/18×9/26
= 4/12×7/7 - 9/18×13/26
= 1/3×1 - 1/2×1/2
= 1/3 - 1/4
= (4-3)/(4×3)
= 1/12
= 4/12×7/7 - 9/18×3/26
= 1/3×1 - 1/2×3/26
= 1/3 - 3/52
= 52/156 - 9/156
= 43/156
==================
7/12×4/7 - 13/18×9/26
= 4/12×7/7 - 9/18×13/26
= 1/3×1 - 1/2×1/2
= 1/3 - 1/4
= (4-3)/(4×3)
= 1/12
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