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算 30%(6.28 +0.94)简便运算

30-(6.28 +0.94) =30-(6.28+0.72+0.22) =30-(7+0.22) =30-7-0.22 =23-0.22 =22.78

30-(6.28 +0.94) =30-(6.28+0.72+0.22) =30-(7+0.22) =30-7-0.22 =23-0.22 =22.78

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