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5/14×12/25×7/9 简便运算 = = =
5/14×12/25×7/9 = 简便运算
人气:221 ℃ 时间:2020-02-06 06:02:06
解答
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
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