42.8×9.9+42.8的简便运算

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42.8×9.9+42.8的简便运算42.8×9.9+42.8的简便运算42.8×9.9+42.8的简便运算42.8×9.9+42.8=42.8x10.9=466.5242.8×9.9+4.28=42

42.8×9.9+42.8的简便运算
42.8×9.9+42.8的简便运算

42.8×9.9+42.8的简便运算
42.8×9.9+42.8
=42.8x10.9
=466.52
42.8×9.9+4.28
=42.8x10
=428

42.8x10-42.8x0.1+42.8=

42.8×10