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9.99%4.26+90.01%5.74的简便运算

9.99-4.26+90.01-5.74 =9.99+90.01-(4.26+5.74) =100-10 =90

9.99-4.26+90.01-5.74 =10-0.01+90+0.01-(4.26+5.74) =10+90-10 =90

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