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43.4%(23.4.7)简便

23×54+34×54-57×44 =(23+34)×54-57×44 =57×54-57×44 =57×(54-44) =57×10 =570 65×43+35×67+24×15 =5×(13×43)+5×(7×67)+(24×3)×5 =5×559+5×469+72×5 =5×(559+469+72) =5×1100 =5500

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