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9.99x7.78 3.33x6.66

你好 9.99x7.78+3.33x6.66 =9.99x7.78+3.33x3x2.22 =9.99x7.78+9.99x2.22 =9.99x(7.78+2.22) =9.99x10 =99.9

9.99X7.78+3.33X6.66 =9.99X7.78+9.99X2.22 =9.99×(7.78+2.22) =9.99×10 =99.9

原式 =9.99x7.78+3.33x3x2.22 =9.99x7.78+9.99x2.22 =9.99x(7.78+2.22) =9.99x10 =99.9 供参考。

9.99x7.78+3.33x6.66 =9.99x7.78+3.33x3x2.22 =9.99x7.78+9.99x2.22 =9.99x(7.78+2.22) =9.99x10 =99.9

9.99X7.78+3.33X6.66 =9.99X7.78+9.99X2.22 =9.99×(7.78+2.22) =9.99×10 =99.9

6.66x3.33十9.99x7.78 =3*2.22*3.33+9.99*7.78 =9.99*2.22+9.99*7.78 =9.99*(2.22+7.78) =9.99*10=99.9

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