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[最佳答案] 简便运算:7/29×3/8+6/29×7/12+3/29×7/9简便运算:7/29×3/8+6/29×7/12+3/29×7/9 7/29×3/8+6/29×7/12+3/29×7/9 =1/29×(7×3/8+6×7/12+3×7/9) =1/29×(203/24)=7/24 7/29×3/8+6/29×7/12+3/29×7/9 =7/29×(3/8+6/12+3/9) =7/29×(29/24)=7/