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5.2×58+52×4.2 =5.2×58+5.2×42 =5.2×(58+42) =5.2×100 =520 寒櫻暖暖 請及時採納,(點擊我的答案下麵的【滿意答案】圖標) 是我前進的動力! 如有不明白, 直到完成弄懂此題! 如還有新的問題,
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