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0.45x580+4.5x42简便计算

380x42+580x38 =38×10×42+580×38 =38×420+580×38 =38×(420+580) =38×1000 =38000

580x46+460x42 =58x460+460x42 =460x(58+42) =460x100 =46000

220x42 580x32用简便方法计算 220x42 580x32 =22*420+22*580+580*10 =22*(420+580)+5800 =22000+5800 =27800

580x42=24360 仅供参考

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