5/14×12/25×7/9 简便运算 = = =5/14×12/25×7/9 = 简便运算

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5/14×12/25×7/9简便运算===5/14×12/25×7/9=简便运算5/14×12/25×7/9简便运算===5/14×12/25×7/9=简便运算5/14×12/25×7/9简便运算==

5/14×12/25×7/9 简便运算 = = =5/14×12/25×7/9 = 简便运算
5/14×12/25×7/9 简便运算 = = =
5/14×12/25×7/9 = 简便运算

5/14×12/25×7/9 简便运算 = = =5/14×12/25×7/9 = 简便运算
5/14×12/25×7/9
= 5/(2×7) × (2×2×3)/(5×5) × 7/(3×3)
= 1/1 × 2/5 × 1/3
= 2/15

=(5*3*4*7)/(2*7*5*5*3*3)=2/15