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同学们,你们都去过大卖场吧?那里每天都有许多的顾客,当顾客推着满满一车物品去付款时,营业员却总能在很短的时间内 告诉 他应该付多少钱。你知道营业员为什么会算得这么快吗?

同学们,你们都去过大卖场吧?那里每天都有许多的顾客,当顾客推着满满一车物品去付款时,营业员却总能在很短的时间内 告诉 他应该付多少钱。你知道营业员为什么会算得这么快吗?. 用计算器计算:. 8023. 2345 + 5678=. 7892 - 129=. 7763. 2345 + 4567 - 4321=. 2591.

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同学们,你们都去过大卖场吧?那里每天都有许多的顾客,当顾客推着满满一车物品去付款时,营业员却总能在很短的时间内 告诉 他应该付多少钱。你知道营业员为什么会算得这么快吗?

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  1. 同学们,你们都去过大卖场吧?那里每天都有许多的顾客,当顾客推着满满一车物品去付款时,营业员却总能在很短的时间内告诉他应该付多少钱。你知道营业员为什么会算得这么快吗?同学们,你们都去过大卖场吧?那里每天都有许多的顾客,当顾客推着满满一车物品去付款时,营业员却总能在很短的时间内告诉他应该付多少钱。你知道营业员为什么会算得这么快吗?

  2. 用计算器计算: 8023 2345+5678= 7892-129= 7763 2345+4567-4321= 2591

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