7/29x3/8+6/29x7/12+3/29x7/9(简便运算）
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7/29x3/8 + 6/29x7/12 + 3/29x7/9
= 7/29x3/8 + 7/29x6/12 + 7/29x3/9
= 7/29 x (3/8 + 6/12 + 3/9)
= 7/29 x (3/8 + 1/2 + 1/3)
= 7/29 x (3×3 + 1×12 + 1×8)/24
= 7/29 x 29/24
= 7/24
= 7/29x3/8 + 7/29x6/12 + 7/29x3/9
= 7/29 x (3/8 + 6/12 + 3/9)
= 7/29 x (3/8 + 1/2 + 1/3)
= 7/29 x (3×3 + 1×12 + 1×8)/24
= 7/29 x 29/24
= 7/24
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