1x3＋2x4＋3x5＋…9x11

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1x3＋2x4＋3x5＋…9x111x3＋2x4＋3x5＋…9x111x3＋2x4＋3x5＋…9x11答案是275答案275

1x3＋2x4＋3x5＋…9x11
1x3＋2x4＋3x5＋…9x11

1x3＋2x4＋3x5＋…9x11
答案是275

答案 275